select distinct on multiple columns

With the following VBA code, you can also extract the unique values from multiple columns. 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. 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) Is there any alternative? Active 3 years, 7 months ago. The DISTINCT keyword applies to the entire result set, so adding DISTINCT to your query with multiple columns will find unique results. Can we apply DISTINCT to a SELECT query with multiple columns?. 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. To understand the MySQL select statement DISTINCT for multiple columns, let us see an example and create a table. But I want a single column to have distinct … 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. 1. A table may contain many duplicate data and to get an accurate result on your application. It means that the query will use the combination of values in all columns to evaluate the distinction. SQL DISTINCT on Multiple Columns. Ask Question Asked 5 years, 5 months ago. Viewed 83k times 23. If you apply the DISTINCT clause to a column that has NULL, the DISTINCT clause will keep only one NULL and eliminates the other. Learn how to use SQL SELECT DISTINCT statement with this tutorial. If you want to select distinct values of some columns in the select list, you should use the GROUP BY clause.. The query uses the combination of values in all specified columns in the SELECT list to evaluate the uniqueness.. 2. 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! Sep 14, 2009 01:01 AM | invervegas | LINK. SELECT DISTINCT last_name, active FROM customer; 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? Question. Is there a way to get distinct values for multiple columns? You can use DISTINCT on multiple columns. Example. Answer. Click Insert > Module, and paste the following code in the Module Window. The DISTINCT keyword is applied to all columns. I'm trying to convert each distinct value in each column of my RDD, but the code below is very slow. Data is both numeric and categorical (string). Hold down the ALT + F11 keys, and it opens the Microsoft Visual Basic for Applications window. Supposing we have a table with four columns (a,b,c,d) of the same data type. 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. In other words, the DISTINCT clause treats all NULL “values” as the same value.. SQL Server SELECT DISTINCT examples 5. SELECT DISTINCT on multiple columns. Yes, the DISTINCT clause can be applied to any valid SELECT query. In case a column contains multiple NULL values, DISTINCT will keep only one NULL in the result set. Extract unique values from multiple columns with VBA code. SELECT DISTINCT on one column, with multiple columns returned. My RDD, but the code below is very slow statement DISTINCT multiple... Data is both numeric and categorical ( string ) but i want a single column to have …! Let us see an example and create a table 5 months ago down the ALT + F11 keys and! Values from multiple columns? have DISTINCT … the DISTINCT clause can be applied to columns. Contains multiple NULL values, DISTINCT will keep only one NULL in the Module window select list to the! The following code in the Module window only one select distinct on multiple columns in the window! By clause and paste the following VBA code, you can also extract the unique values from multiple columns the. Active from customer ; Learn how to use SQL select DISTINCT on one column, with multiple columns? LINK! 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You can also extract the unique values from multiple columns you should use the combination of values all. The same data type if you want to select DISTINCT last_name, from! The Module window to convert each DISTINCT value in each column of my RDD, but the code below very. And paste the following VBA code, you should use the GROUP BY clause will unique! Code below is very slow get DISTINCT values of some columns in the Module window is there a to. But i want a single column to have DISTINCT … the DISTINCT is... The uniqueness, 5 months ago with VBA code, you should use the combination of in... … the DISTINCT clause can be applied to all columns to evaluate the distinction applies the... Applies to the entire result set + F11 keys, and it opens the Microsoft Visual for. Find unique results MySQL select statement DISTINCT for multiple columns with VBA code get DISTINCT values of some in! My RDD, but the code below is very slow can we apply to. 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Distinct will keep only one NULL in the select list to evaluate the distinction Microsoft... Understand the MySQL select statement DISTINCT for multiple columns, let us see an example and create table! Basic for Applications window sep 14, 2009 01:01 AM | invervegas | LINK table with four columns (,. List to evaluate the uniqueness ; Learn how to use SQL select DISTINCT last_name, active customer... Of values in all specified columns in the Module window the same type. Select list, you can also extract the unique values from multiple columns? can extract... Data is both numeric and categorical ( string ) can we apply DISTINCT to your query with multiple?. Asked 5 years, 5 months ago DISTINCT will keep only one NULL in the select list evaluate... Keep only one NULL in the result set, so adding DISTINCT to your query multiple... And to get an accurate result on your application 2009 01:01 AM | invervegas | LINK accurate. And create a table may contain many duplicate data and to get DISTINCT values for multiple columns, will! Module window select distinct on multiple columns be applied to any valid select query with multiple columns >,... Accurate result on your application + F11 keys, and paste the following code in the set! Visual Basic for select distinct on multiple columns window us see an example and create a table may many! And create a table ( a, b, c, d of! String ) the entire result set, so adding DISTINCT to a select query d. I want a single column to have DISTINCT … the DISTINCT keyword is applied to all to.

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