select distinct on multiple columns


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