sql select earliest date for each groupsql select earliest date for each group

Using window functions (works in Oracle, Postgres 8.4, SQL Server 2005, DB2, Sybase, Firebird 3.0, MariaDB 10.3) select * from ( select username, date, value, row_number () over (partition by username order by date desc) as rn from yourtable ) t where t.rn = 1 Share Improve this answer Follow edited Aug 27, 2018 at 6:20 a_horse_with_no_name How to Install and Run Apache Kafka on Windows? I couldn't get it to work though, I updated the query with the actual query I've been using (which is pretty complex), but the result is still the same. In case the. Is lock-free synchronization always superior to synchronization using locks? This is the simple old school approach that works with almost any db engine, but you have to watch out for duplicates: Using window functions will avoid any possible issues with duplicate records due to duplicate date values, so if your db engine allows it you can do something like this: Using window functions (works in Oracle, Postgres 8.4, SQL Server 2005, DB2, Sybase, Firebird 3.0, MariaDB 10.3). In this example it would return both Workflow13 and Workflow20 for Company B, but if you needed the earliest date for each company to identify the Workflow you would need to include a sub-select. Launching the CI/CD and R Collectives and community editing features for How to take particular number for each group. Inner Query will return the latest date for the current user, Outer query will pull all the data according to the inner query result. I did. Configure SQL Jobs in SQL Server using T-SQL, Difference between Structured Query Language (SQL) and Transact-SQL (T-SQL), Select different values on two select tags in Vue.js, Prove that Every Cyclic Group is an Abelian Group. Finally, I group the result. What can a lawyer do if the client wants him to be aquitted of everything despite serious evidence? The SQL ROW_NUMBER Function allows you to assign the rank number to each record present in a partition. The main difference from the previous two window functions is that it does not return tied values. How do I get the current date in JavaScript? How to Set Java Path in Windows and Linux? Prevent loops when you can. 0 Likes 1 ACCEPTED SOLUTION Accepted Solutions TomKari write the relevant part of the query without knowing anything about the table SQL to return earliest date. Invoice Currency 5. You can even send a short message service (SMS) to a person's cell phone, if needed. created_at. relevant links for operators/functions mentioned above: displaying the latest orders to the admins of your application (they see two Please note that records unused from a day may be reported to a new one. (holding_id and holding_type together ensure a unique StockHolding or This is a simple "group by" using the fact the the "most recent" date is the "highest valued", or max(), date. Making statements based on opinion; back them up with references or personal experience. How to Define a Window Frame in SQL Window Functions. Making statements based on opinion; back them up with references or personal experience. However, the window functions do not group the result into a single row as aggregate functions do. Therefore, they To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If your database syntax supports it, then TOP 1 WITH TIES can be a lifesafer in combination with ROWNUMER. @ypercube I've edited the question with distinct on. For example, the following query returns the user_id and start_date columns for the first row of each group: How to Select Group of Rows that Match All Items on a List in SQL Server? Dealing with hard questions during a software developer interview. How do you want to handle ties? To get the earliest date values then insert a group on date field for each month and place all the fields in group header which gives you the first values (earliest dates) from your databsae fields. fluctuate over time. Id First_Date Second_Date Flag ABC12345 2022-05-18 2022 . I didn't switch ID in one section to Site_Id. With select, it will be impossible so you need to remove the label and display the select directly. I'm pulling data from a database and one of the tables contain two columns that together identify a location and another column containing a date of each time it was serviced. timestamp in the ON clause. this situation youd really just want to pick one of the two and adding a If that doesnt quench your thirst, you can always use the Window Functions Practice Set to get your fingers more agile in writing code! user. It was a query to get last location for salesman as per recent time detected on PDA devices. For that, read the ranking functions overview and the complete guide to ranking rows in SQL. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? recent record in a single table. Privacy Policy, Oldest or Most Recent records relative to another field. BondHolding). Not the answer you're looking for? You can use a correlated subquery to find the minimum row of each group in SQL: In this query, I select three columns: artist, song_name, and number_of_streams from the table streaming_data. You may want to have the Window Functions Cheat Sheet open for following the next code. How to retrieve rows with max value in one column for each combination of other two columns? This works really nicely, so simple. The design of a robot and thoughtbot are registered trademarks of The first approach is to use an embedded select. Was Galileo expecting to see so many stars? @Narshe sorry I missed up your comments for some reason :/ But you are absolutely right. Are there conventions to indicate a new item in a list? sql rails postgres web A common query that crops up in web apps is finding the oldest or the most recent record in a single table. Steps. How To Generate Unit Step, Sinusoidal and Exponential Signal in MATLAB. Steps: Steps 1: To select the first row of each group in SQL, you can use the ' GROUP BY ' clause in combination with an aggregate function such as ' MIN () ' or ' MAX () '. included in the result set per the holding_value_stamps2.id IS NULL in the References. Basically for each ID, if the value of the 'Controlled' column is 1, and there is more than 1 measurement that fits, I want to select the earliest observation (by date). Select ONE most recent post for each author, Finding two most recent payments for every sale. rev2023.3.1.43269. How to Assign a Successive Number to Each Row in SQL Server? Its not very efficient. But what if you want to show song names and the number of streams, too? You see the only difference, right? The idea is to partition the rows by the ID - OVER (PARTITION BY id) - and then either assign row numbers (ordered by the datetime) or find the minimum datetime per ID. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. You can even Get the first and last entry added per each user in SQL. I see most of the developers use an inline query without considering its impact on huge data. I give the alias st_outer to the table since this is my outer query and I reference this table again in the correlated subquery. Here's one way to return only the most recent record for each user in SQL Server: This uses a common table expression (CTE) to assign a unique rn (row number) to each record for each user, based on the user_id and sorted in descending order by date. In fact, I ended up reading about CASE statements for 15 minutes before I said "Screw it, someone on SO knows how to answer this." What's the difference between a power rail and a signal line? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A problem may surface when you want to select several columns but only one row from each group. There are three different artists: Prince, Paul Simon, and Donny Hathaway. The solution is to use the ROW_NUMBER () function. SELECT ID, DateTime, String FROM ( SELECT ID, DateTime, String, ROW_NUMBER () OVER (PARTITION BY ID ORDER BY DateTime) RN FROM tableName ) a WHERE RN = 1 SQLFiddle Demo Share Improve this answer Follow answered Oct 25, 2013 at 12:04 John Woo 256k 69 492 489 WHERE (SRECTYPE = 'C') AND (ACCOUNTNO IS NOT NULL) AND . The second approach for selecting the first row of each group is to combine window functions and common table expressions. rev2023.3.1.43269. Just to add something to what @MarcoRoy said, if you happen to have more than one record with the same max date, if you change the query, like when you are debugging it, a different record may receive a row number of 1, so the results may be inconsistent. FROM MyTable m JOIN ( SELECT ID, MAX ( [ Date ]) As MaxDate FROM MyTable GROUP BY ID) g ON m.ID = g.ID AND m. [ Date] = g.MaxDate. Use a subquery to find the latest date for each group of cmpnt_name. sql date select subset Share Follow asked Apr 20, 2011 at 21:24 dvanaria You get a thorough guide to what they can do via the hands-on window functions course. SELECT the AVG of the value and GROUP BY the date. Why do we kill some animals but not others? The open-source game engine youve been waiting for: Godot (Ep. How to return only the Date from a SQL Server DateTime datatype, How to concatenate text from multiple rows into a single text string in SQL Server, Retrieving the last record in each group - MySQL. You would use aggregate function MAX and GROUP BY. If you accept that the sub-select will . How do I perform an IFTHEN in an SQL SELECT? Connect and share knowledge within a single location that is structured and easy to search. Thanks a lot for such a technical query. I used this way to take the last record for each user that I have on my table. Asking for help, clarification, or responding to other answers. Do EMC test houses typically accept copper foil in EUT? case of users making orders its pretty unlikely short of a double-submit Packages are schema objects that groups logically related PL/SQL types, variables, and subprograms. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? I can't figure this out. You know, functions like MIN(), MAX(), SUM(), COUNT(), AVG(), etc. You can group by id and trunc date value: SELECT t.id, cast (t . What is the difference between "INNER JOIN" and "OUTER JOIN"? bug, but depending on your use-case for the table in question and the scale of You can just group by your criteria and then select the latest from each group. Making statements based on opinion; back them up with references or personal experience. Asking for help, clarification, or responding to other answers. A totals query is a select query that uses aggregate functions (such as Group By, Min, Max, Count, First, and Last) to calculate values for each output field. A larger one if you are doing something user-facing. If you'd interested in providing a sample data set (e.g. Finally, the WHERE clause ensures that we dont select any that dont One caveat: theres a slight issue with using a datetime as an identifier here. this kind of filtering and ordering in Ruby: That said, the database level solutions in this post have been performant in Using the window functions and CTE to get the first row of each group is recommended for a few reasons. orders table itself. Invoice Number 2. The name of my CTE is first_row. Due to its logic, it's often used with aggregate functions. You can also use this SQL query to get top 1 row in each group in MySQL, PostgreSQL, SQL Server & Oracle. In database theory, relational algebra is a theory that uses algebraic structures with a well-founded semantics for modeling data, and defining queries on it. See Also. In short, a correlated subquery is a type of subquery that is executed row by row. How can I do an UPDATE statement with JOIN in SQL Server? The open-source game engine youve been waiting for: Godot (Ep. In this post, we will be covering all the solutions to SQL on the HackerRank platform. actually this works only for duplicates, if you have more than 2 values, the condition a.date < b.date does not work, meaning, it is not a general solution, although the idea of working with the LEFT OUTER JOIN is the important thing in this answer. WHERE clause). 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. For this I have created new table in SQL database & written below query. But I filter the data using a WHERE clause. Doing it this way will cause the inner query to run once for each name in the table, causing a major slowdown for any table of significant size. Why is there a memory leak in this C++ program and how to solve it, given the constraints? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Does Cosmic Background radiation transmit heat? What are the options for storing hierarchical data in a relational database? You can use ROW_NUMBER () which generates sequential number that you can filter with. This function takes two arguments, the first being the column you want to group by and the second being the column you want to select. Update: I forgot that I needed to have a value that goes along with the latest date. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam. With a different name and a different number of streams for each song, it isnt much of a grouping. Trying to give DISTINCT ON () a try. I'm having difficulties understanding the NOT EXISTS version. How to handle multi-collinearity when all the variables are highly correlated? Is it possible to write a SQL query such that I get the most recent time that each location was serviced? This adds a The second keyword is the ORDER BY, which tells it to rank by the column number_of_streams in ascending order. Get all records aggregated with Minimum function on the [TransDate] grouped by [UserName] field. One thing I don't understand is the IS NULL part: If the table self join based on username (a.username = b.username) then how would we find b.username is NULL in the result window? Use a subquery to get the min DateTime for each ID group, then use that to qualify which of the IDs you pull. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? Story Identification: Nanomachines Building Cities, Theoretically Correct vs Practical Notation. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Want to master SQL window functions? (and thus the result of the query) is fully deterministic only if the keys in the ORDER BY clause make each row unique. For the second question, I could generate a series of dates for the interval needed and then use WITH rows As and do the query grouping by product_id and sum by amount and then select for each date the previous values from rows with a limit 1 but that does not sound that optimized either. Is something's right to be free more important than the best interest for its own species according to deontology? centos7 lamp 2023/03/02 12:10 On Oracle 8i+, SQL Server 2005+, PostgreSQL 8.4+, DB2, Firebird 3.0+, Teradata, Sybase, Vertica: Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. You can use it to select top 1 row for each group. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? Solution 1. How to set fixed width for in a table ? The English identity is of Anglo-Saxon origin, when they were known in Old English as the Angelcynn, meaning race or tribe of the Angles.Their ethnonym is derived from the Angles, one of the Germanic peoples who migrated to Great . But as long as you really don't care, then this shouldn't be a problem. Is there a way to do this in SAS EG via point and click? Theoretically Correct vs Practical Notation. The first is PARTITION BY, which I use to rank rows only within each artist. Clash between mismath's \C and babel with russian, Ackermann Function without Recursion or Stack, Is email scraping still a thing for spammers. When there are two entries for the same date for the same user, it will return the one with the highest value. structure of the . bit of complexity, but with a JOIN and a sub-select the query remains Launching the CI/CD and R Collectives and community editing features for how do you select a field from the oldest day in a sql query, I am working on a SQL query to filter the category based on the oldest datetime of its respective fruit. To select the first row of each group in SQL, you can use the GROUP BY clause with the MIN or MAX aggregate function. Thanks for contributing an answer to Database Administrators Stack Exchange! no record with a created_at that is greater than their own. How to return only the Date from a SQL Server DateTime datatype. in SQL i can do it this way. Not the answer you're looking for? In addition, the code gets messy and difficult to read if you write a little more complex query and subquery. First, its much more efficient. Code-only answers like yours are less appreciated when compared to answers which explain the solution. Find centralized, trusted content and collaborate around the technologies you use most. This can return more than one row if there are rows with the same minimum date. It is very important that you all first give it a try & brainstorm yourselves before having a look at the solutions. '2018-10-18', that is, a date string. real production environments. Invoice Amount 7. rev2023.3.1.43269. Jordan's line about intimate parties in The Great Gatsby? First it groups by Id, then sorts the items within the group by Date in descending order, and returns the first one, SelectMany then flattens the list. Returns the first value within an ordered group of values. Any help is appreciated! For example, you may want to use the DENSE_RANK() functions instead of RANK() to get the same result as above: Both functions returns all the rows that are tied (i.e., have the same rank), so they are ideal if you want to show all the rows with the same minimum value. In case of tie, though, you will get both. The number of employee IDs will vary every time the sproc is Solution 1: If you have an SQL 2008 or . . This function is followed by an OVER() clause with two keywords in the parentheses. The first task is to find the first job (by hire date) for each person. Worth clarifying which Sybase product / version. The number of distinct words in a sentence. In other words, these two SELECT statements return the data for rows where the number of streams equals the minimum number of streams. RANK() and DENSE_RANK() are not the same. How to Rank Rows in SQL: A Complete Guide. How do I perform an IFTHEN in an SQL SELECT? Lets look at another, slightly more return only the subset of user_ids paired with their most recent order this This time, I ordered it in descending rather than ascending order. Group by the GroupID field, and choose the "Min" option for the RecordDate, to return the earliest date for each query. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Prepare for Your Knowledge TestsCanadian written driving tests differ slightly across each province in terms of their content and number of questions. In my case, I had multiple records, for the same date, which also shared the same reference id. created_at that we discussed earlier, both of those records would find their GL Date QueryAccount Payables Invoice Query Column Details. Thank you. Example: Nevermind, I think I got it. Is there a way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution? On the Design tab, in the Query Setup group, click the down arrow next to All (the Top Values list), and either enter the number of records that you want to see, or select an option from the list. Add a column with a default value to an existing table in SQL Server, How to return only the Date from a SQL Server DateTime datatype. This works as long as you also aren't trying to get a Unique Workflow as well. For each ID that has more than one Value, I want to output the earliest observation into a new column 'First', and the latest observation into a new column 'Last'. And what do you get? 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. This forum has migrated to Microsoft Q&A. How do I import an SQL file using the command line in MySQL? The subquery gets me these minimum values with the MIN() aggregate function. My aim was to take the latest inserted record. 1 Answer Sorted by: 3 SELECT t1.id, MIN (tbls.DATE) FROM table1 t1 INNER JOIN (SELECT id, DATE FROM tableprt UNION ALL SELECT id, DATE FROM tableonl UNION ALL SELECT id, DATE FROM tablesrv) tbls ON t1.id = tbls.id GROUP BY t1.id Note: no need to do UNION ALL here As Martin Noted Even though UNION ALL isn't required it may be faster Share You may or may not want this. You use GROUP BY when you need to group data in SQL. How can the mass of an unstable composite particle become complex? Is there a way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How do I perform an IFTHEN in an SQL SELECT? SELECT column1, column2, FIRST_VALUE (column2) OVER . Unfortunately, we cant select the value field from this query I was able to do so by modifying the query above and adding order by date desc, PK_id desc) as Andrew suggested. If there are two (or more) rows with exactly same datetime for an ID, they will be both in the result. Presuming you have a revision field, one way to do that: SELECT table.cmpnt_name, table.revisionmi,ner, table.revdate, . Thats because I want the minimum number of streams where the artist from the correlated subquery is the same artist from the outer query. GROUP BY exists to solve this problem: What if you wanted to display the users name instead of the id? Rss reader explain the solution appreciated when compared to answers which explain the solution to! What are the options for storing hierarchical data in SQL: a complete guide to ranking rows in.! Return the one with the min ( ) a try column1,,. Robot and thoughtbot are registered trademarks of the developers use an embedded select in combination with ROWNUMER select,. Understanding the not EXISTS version if you have a value that goes along with the min for. Line about intimate parties in the result set per the holding_value_stamps2.id is NULL in the.. The SQL ROW_NUMBER function allows you to assign a Successive number to each record present in a partition rail a... Which generates sequential number sql select earliest date for each group you can even send a short message service ( SMS ) to person. Minimum number of streams equals the minimum number of streams for each song, will! Column Details where clause program and how to set Java Path in Windows and Linux max value in section. The result into a single row as aggregate functions a query to get a Unique Workflow as well each! Wishes to undertake can not be performed by the date from a query! Query without considering its impact on huge data within an ordered group of.! To database Administrators Stack Exchange connect and share knowledge within a single location that is, a subquery. Did n't switch ID in one section to Site_Id ) clause with two keywords in result! S often used with aggregate functions do not group the result: (! Mass of an unstable composite particle become complex reference ID therefore, they will be covering all the are! First is partition by, which tells it to rank rows in SQL Paul,! [ UserName ] field reference ID driving tests differ slightly across each province in of... The mass of an unstable composite particle become complex these two select statements return the data for rows the... Privacy policy, Oldest or most recent records relative to another field robot and thoughtbot are registered trademarks of developers. My table trunc date value: select t.id, cast ( t the data using where... Reference ID sql select earliest date for each group such that I get the min ( ) which generates sequential that! Difference between a power rail and a Signal line have an SQL select be free more important the! Single row as aggregate functions a robot and thoughtbot are registered trademarks of the developers use an inline query considering!, table.revisionmi, ner, table.revdate, community editing features for how to Define a window in! In Windows and Linux first is partition by, which I use to rank rows SQL... ) which generates sequential number that you all sql select earliest date for each group give it a try & amp written... For selecting the first and last entry added per each user in SQL you have a revision field one. Developer interview the data using a where clause but not others you need to group in... And Linux two most recent post for each song, it will return the data for rows the! An unstable composite particle become complex the HackerRank platform, if needed province in terms service! A revision field, one way to do that: select table.cmpnt_name table.revisionmi... Difficulties understanding the not EXISTS version you write a little more complex query and subquery for storing hierarchical in. Was a query to get sql select earliest date for each group Unique Workflow as well when compared to which... Can filter with can a lawyer do if the client wants him to aquitted... Him to be aquitted of everything despite serious evidence entry added per each in! Into your RSS reader group data in SQL Finding two most recent time detected on PDA devices variable. I get the min ( ) are not the same interest for its own species according deontology. Having difficulties understanding the not EXISTS version first and last entry added per each user SQL. An SQL file using the command line in MySQL each group, Sinusoidal and Signal! Workflow as well second approach for selecting the first is partition by, which I use to by. Enforce proper attribution unstable composite particle become complex subquery gets me these minimum values with the same date. Post, we will be covering all the solutions to SQL on HackerRank. To other answers personal experience exactly same DateTime for an ID, they will be so! When there are three different artists: Prince, Paul Simon, and Donny Hathaway rank ( ) are the... Location was serviced statements return the one with the min DateTime for an ID, they to subscribe this. From each group ( or more ) rows with max value in one column for each group to! N'T switch ID in one column for each group of cmpnt_name a created_at that we discussed earlier, both those. Two most recent records relative to another field or at least enforce proper?! & amp ; written below query the ID give distinct on ( a. The data using a where clause s often used with aggregate functions do record present a. First give it a try & amp ; brainstorm yourselves before having a look at the solutions in.. You agree to our terms of service, privacy policy, Oldest or most records. Are there conventions to indicate a new item in a list needed to have the window and. Policy and cookie policy visualize the change of variance of a robot and thoughtbot are trademarks. Approach for selecting the first and sql select earliest date for each group entry added per each user in SQL for an! The best interest for its own species according to deontology a table query and I reference this again! A power rail and a Signal line with two keywords in the parentheses different of! To search value: select table.cmpnt_name, table.revisionmi, ner, table.revdate, of tie,,... Are absolutely right you & # x27 ; 2018-10-18 & # x27 ;, that is, correlated... File using the command line in MySQL some reason: / but you are something! Added per each user in SQL current date in JavaScript generates sequential number you... A Unique Workflow as well and Donny Hathaway on ( ) which generates sequential number that you all first it! Its impact on huge data, and Donny Hathaway an OVER ( ) function difference from the two. Result into a single row as aggregate functions can use ROW_NUMBER ( ) and DENSE_RANK ( ) function. Column for each author, Finding two most recent records relative to field! Licensed under CC BY-SA kill some animals but not others would find their GL date Payables. Values with the highest value query and subquery software developer interview project he wishes to undertake can not be by... Data for rows where the number of streams where the number of streams for each group rank ( and! Become complex at least enforce proper attribution game engine youve been waiting for Godot! Number that you all first give it a sql select earliest date for each group & amp ; brainstorm yourselves before a. Be covering all the variables are highly correlated ( e.g in SQL window functions do group. The ranking functions overview and the complete guide Feb 2022 try & amp ; written below query OVER. ( t by [ UserName ] field ( or more ) rows with the highest value them with! The SQL ROW_NUMBER function allows you to assign the rank number to each record present in a table interested providing! To the table since this is my outer query however, the code gets and! Having a look at the solutions Windows and Linux my video game to stop plagiarism or at least enforce attribution! Qualify which of the value and group by ID and trunc date value: select,... As long as you really do n't care, then this should n't be a lifesafer combination... Use group by when you want to have the window functions is that it does not tied... By when you want to have the window functions and common table expressions date ) for each person d in! The difference between `` INNER JOIN '' n't care, then this should n't be problem. Can group by EXISTS to solve it, then use that to qualify which the! Is followed by an OVER ( ) function SQL window functions in.! Using the command line in MySQL number for each group of values to be aquitted everything! Recent records relative to another field JOIN in SQL window functions do not group the result its own species to... Combine window functions is that it does not return tied values Server DateTime datatype these minimum values the. Developer interview in Windows and Linux than their own agree to our terms of service, privacy policy cookie... First row of each group is to use an embedded select need to group data SQL... Reason: / but you are absolutely right to deontology, then this should n't be a may. Can group by when you need to group data in a relational database impossible so you need remove., Finding two most recent post for each author, Finding two recent... To solve this problem: what if you wanted to display the users name instead of value. Rows in SQL Server DateTime datatype up your comments for some reason: / but you are right... Or responding to other answers second keyword is the difference between `` INNER JOIN '' ``... 2023 Stack Exchange to rank by the date from a SQL Server minimum date user in SQL vary every the... Open-Source game engine youve been waiting for: Godot ( Ep ; user contributions licensed under CC BY-SA knowledge!, column2, FIRST_VALUE ( column2 ) OVER to search record present in a?. Which tells it to select TOP 1 row for each combination of two...

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