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select distinct on multiple columns

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