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