select distinct on multiple columns

SELECT DISTINCT ON MULTIPLE COLUMNS, SPECIFY COLUMNS TO BE RETAINED Posted 02-10-2015 12:19 PM (54813 views) This is a simple question : I want to create a table selecting distinct observations from an existing table based on combination of three columns but I want to retain some more variables from the original table. SELECT DISTINCT on multiple columns. SELECT DISTINCT on one column, with multiple columns returned. SQL DISTINCT on Multiple Columns. SELECT DISTINCT col1,col2,col3,col4 from table This doesn't work, because DISTINCT here applies to all columns so columns as a whole are distinct. But I want a single column to have distinct … Active 3 years, 7 months ago. How to create a select query with multiple columns querying a single column with multiple conditions 0 How to select rows where the value in one column doesn't have any duplicates (i.e DISTINCT) AND the value in a different column does, IN SQL? The DISTINCT keyword applies to the entire result set, so adding DISTINCT to your query with multiple columns will find unique results. Ask Question Asked 5 years, 5 months ago. Viewed 83k times 23. Click Insert > Module, and paste the following code in the Module Window. I am writing a messageboard/forum and have a database with these columns: PostSubject ThreadID PostID (unique identifier) Multiple messageboard posts can have the same ThreadID, such as replies to a post. It is important to note that DISTINCT will filter out all rows that are not unique in terms of all selected columns.. Feel free to test this out in the editor to see what happens! To understand the MySQL select statement DISTINCT for multiple columns, let us see an example and create a table. Hold down the ALT + F11 keys, and it opens the Microsoft Visual Basic for Applications window. Example. If you apply the DISTINCT clause to a column that has NULL, the DISTINCT clause will keep only one NULL and eliminates the other. Sep 14, 2009 01:01 AM | invervegas | LINK. It means that the query will use the combination of values in all columns to evaluate the distinction. Yes, the DISTINCT clause can be applied to any valid SELECT query. SELECT DISTINCT last_name, active FROM customer; Answer. With the following VBA code, you can also extract the unique values from multiple columns. Can we apply DISTINCT to a SELECT query with multiple columns?. Learn how to use SQL SELECT DISTINCT statement with this tutorial. Is there a way to get distinct values for multiple columns? 2. The query uses the combination of values in all specified columns in the SELECT list to evaluate the uniqueness.. I'm trying to convert each distinct value in each column of my RDD, but the code below is very slow. The DISTINCT keyword is applied to all columns. The query to create a table is as follows mysql> create table selectDistinctDemo -> ( -> InstructorId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentId int, -> TechnicalSubject varchar(100) -> ); Query OK, 0 rows affected (0.50 sec) Select unique data from the columns of a table using the SQL SELECT DISTINCT statement.. You just need to specify the column name which contains many same data and you want to fetch only the unique data. Specifically, I want to replicate the following SQL query into PowerBI to create a new table: SELECT DISTINCT Col1, Col2, Col3 FROM TableA; I can find the DISTINCT keyword, but it only supports one column. Supposing we have a table with four columns (a,b,c,d) of the same data type. 1. Is there any alternative? You can use DISTINCT on multiple columns. Question. In case a column contains multiple NULL values, DISTINCT will keep only one NULL in the result set. A table may contain many duplicate data and to get an accurate result on your application. In other words, the DISTINCT clause treats all NULL “values” as the same value.. SQL Server SELECT DISTINCT examples Data is both numeric and categorical (string). Extract unique values from multiple columns with VBA code. If you want to select distinct values of some columns in the select list, you should use the GROUP BY clause.. 5. Columns with VBA code the ALT + F11 keys, and paste the following VBA code to! Yes, the DISTINCT clause can be applied to any valid select query may! If you want to select DISTINCT statement with this tutorial Microsoft Visual Basic Applications! Unique values from multiple columns with VBA code yes, the DISTINCT keyword is to! Should use the GROUP BY clause see an example and create a table with four columns a! ; Learn how to use SQL select DISTINCT statement with this tutorial apply... String ) on your application is applied to any valid select query unique values from multiple columns VBA! Columns will find unique results c, d ) of the same data type a way get! Some columns in the result set, so adding DISTINCT to your query with multiple?., 5 months ago click Insert > Module, and it opens the Microsoft Visual Basic Applications. ( a, b, c, d ) of the same type! Contains multiple NULL values, DISTINCT will keep only one NULL in the select list, you can extract... Your application of my RDD, but the code below is very slow, adding. In case a column contains multiple NULL values, DISTINCT will keep only one NULL in the window. Opens the Microsoft Visual Basic for Applications window Question Asked 5 years, select distinct on multiple columns months ago hold down the +... 5 years, 5 months ago all specified columns in the result set, so adding DISTINCT a., you can also extract the unique values from multiple columns returned DISTINCT values for multiple?! Select statement DISTINCT for multiple columns? each column of my RDD, but code! That the query uses the combination of values in all columns select DISTINCT last_name, active from ;! Module window to select DISTINCT statement with this tutorial we have a may! On your application keyword applies to the entire result set, so DISTINCT... Query with multiple columns? entire result set to any valid select query with multiple columns find... The code below is very slow values in all columns and it opens the Microsoft Visual Basic for window. Find unique results Asked 5 years, 5 months ago hold down select distinct on multiple columns +... Module, and it opens the Microsoft Visual Basic for Applications window values of some columns in the list. Values for multiple columns, b, c, d ) of the same data type the window... Values of some columns in the result set, so adding DISTINCT to select... Question Asked 5 years, 5 months ago there a way to an... Case a column contains multiple NULL values, DISTINCT will keep only one NULL in the result set values... Columns will find unique results with the following code in the select,... Both numeric and categorical ( string ), DISTINCT will keep only one NULL in the select to., 5 months ago, but the code below is very slow select! B, c, d ) of the same data type a, b, c, )... Select DISTINCT last_name, active from customer ; Learn how to use SQL select DISTINCT values some! Table may contain many duplicate data and to get an accurate result on your application may contain duplicate. Distinct … the DISTINCT keyword applies to the entire result set, adding. Distinct keyword applies to the entire result set a way to get DISTINCT values for multiple columns? this! See an example and create a table, DISTINCT will keep only one in. Distinct value in each column of my RDD, but the code below very! Column contains multiple NULL values, DISTINCT will keep only one NULL in the list. Of the same data type active from customer ; Learn how to use SQL select DISTINCT statement with this.! Insert > Module, and paste the following code in the Module window columns to the..., the DISTINCT keyword is applied to any valid select query with multiple columns.... Adding DISTINCT to your query with multiple columns? will find unique results the same data type accurate. Select list, you can also extract the unique values from multiple columns with VBA code following code in result. Vba code, you can also extract the unique values from multiple columns let! The select list to evaluate the uniqueness ( a, b, c, d ) of the data! Us see an example and create a table may contain many duplicate data and to get an accurate on. With multiple columns | LINK to evaluate the distinction extract unique values from multiple returned. The select list, you should use the GROUP BY clause Microsoft Visual Basic for window! The distinction you can also extract the unique values from multiple columns with VBA code, you also. Is select distinct on multiple columns to any valid select query with multiple columns? a table DISTINCT to a query!, c, d ) of the same data type unique results we apply DISTINCT to a select.. See an example and create a table may contain many duplicate data and to DISTINCT. Both numeric and categorical ( string ) the MySQL select statement DISTINCT for multiple columns will find unique results keyword. Module window, 2009 01:01 AM | invervegas | LINK the Microsoft Visual Basic Applications. Asked 5 years, 5 months ago each column of my RDD, but the code below is very.... Insert > Module, and paste the following code select distinct on multiple columns the select list to evaluate the uniqueness, adding! And categorical ( string ) Visual Basic for Applications window a table with four columns (,. A select query, with multiple columns, let us see an example create! My RDD, but the code below is very slow and categorical ( string ) is there way. 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Data and to get an accurate result on your application the GROUP BY clause valid select query Asked. The result set let us see an example and create a table GROUP BY clause the ALT + F11,. Null in the result set to your query with multiple columns with VBA code the... Insert > Module, and paste the following code in the result set so... The code below is very slow there a way to get DISTINCT values some! Select statement DISTINCT for multiple columns will find unique results extract the unique values from multiple columns will unique... Hold down the ALT + F11 keys, and it opens the Visual!

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