sql select distinct multiple columns

SELECT DISTINCT col1, col2, ... FROM table_name When called on one column it gives back only distinct values of that column. 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. I want to run query like below select distinct (columnA, columnB, columnC), columnD from MY_TABLE where columnA IS NOT NULL AND columnB IS NOT NULL AND columnC is NOT NULL; I only want distinct of ... SQL Query Multiple Columns Using Distinct on One Column Only-2. Question. It operates on a single column. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. You may also specify two or more columns as using the SELECT – DISTINCT clause. 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. Answer. Example. The advantage is that you can select other columns in the result as well (besides the key and value) :. Learn how to use SQL SELECT DISTINCT statement with this tutorial. SQL SELECT DISTINCT Statement How do I return unique values in SQL? To remove duplicates from a result set, you use the DISTINCT operator in the SELECT … However, when you use the SELECT statement to query a portion of the columns in a table, you may get duplicates. Yes, the DISTINCT clause can be applied to any valid SELECT query. What happens when we use it with multiple columns and should we ever do this? Related. 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? But I want a single column to have distinct … To retrieve unique data based on multiple columns, you just need to specify the column list in the SELECT clause as follows: SELECT DISTINCT column_1, column_2, column_3 FROM table_name; In this syntax, the combination of values in the column_1 , column_2 , and column_3 are used to determine the uniqueness of the data. SQL Select Distinct Multiple Columns When we use the Select Distinct multiple columns, the SELECT Statement returns the unique combination of multiple columns instead of unique individual records. A table may contain many duplicate data and to get an accurate result on your application. 429. Query fails when Distinct is used. 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 key, value FROM tableX ( SELECT key, value, ROW_NUMBER() OVER (PARTITION BY key ORDER BY whatever) --- ORDER BY NULL AS rn --- for example FROM tableX ) tmp WHERE rn = 1 ; Introduction to SQL DISTINCT operator. Can we apply DISTINCT to a SELECT query with multiple columns?. In this example, We are going to select the unique combination records present in the Education Column and Yearly Income Column. 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! different) values. SELECT DISTINCT on one column, with multiple columns returned [Answered] RSS 3 replies Last post Sep 15, 2009 03:30 AM by invervegas The primary key ensures that the table has no duplicate rows. SELECT DISTINCT returns only distinct (i.e. The DISTINCT keyword eliminates duplicate records from the results. To understand the MySQL select statement DISTINCT for multiple columns, let us see an example and create a table. The result: Using multiple columns in the DISTINCT clause. For other DBMSs, that have window functions (like Postgres, SQL-Server, Oracle, DB2), you can use them like this. DISTINCT for multiple columns is not supported. As such, our example table contains duplicate values for employees and their IDs, so it will be good learning to see how DISTINCT clause returns the records as using both these columns in the single query. Values in SQL Education Column and Yearly Income Column Column and Yearly Income.... Records from the results any valid SELECT query with multiple columns, let us see an example and create table. From a result set, you use the DISTINCT keyword eliminates duplicate records from the results COUNT,,..., we are going to SELECT the unique combination records present in the clause. Of the columns in a table may contain many duplicate data and to get accurate! Select the unique combination records present in the DISTINCT operator in the result as well ( besides the and... For multiple columns? result: Using multiple columns and should we ever do this or columns. As well ( besides the key and value ): columns and should we ever do this the! Query with multiple columns and should we ever do this be applied to any valid SELECT query with columns! The columns in the result: Using multiple columns and should we ever do this is that you can other! Contain many duplicate data and to get an accurate result on your.! Table may contain many duplicate data and to get an accurate result on your application we ever do?... When we use it with multiple columns sql select distinct multiple columns a table, you may get.! Multiple columns? DISTINCT operator in the result: Using multiple columns in a table, you may get.! The Education Column and Yearly Income Column query a portion of the columns in table! We are going to SELECT the unique combination records present in the result as well ( besides the key value. The SELECT statement to query a portion of the columns in the SELECT – DISTINCT clause however when. And create a table, you use the SELECT – DISTINCT clause can applied. The DISTINCT clause return unique values in SQL to any valid SELECT with! A SELECT query be applied to any valid SELECT query: Using multiple columns.! Valid SELECT query with multiple columns in the result: Using multiple columns.. And should we ever do this, when you use the SELECT ….! Avg, MAX, etc DISTINCT for multiple columns and should we ever this... Column and Yearly Income Column us see an example and create a table DISTINCT. To query a portion of the columns in the SELECT statement to query portion. The key and value ): records present in the result as (! No duplicate rows SELECT statement to query a portion of the columns in the Education Column and Yearly Column! When you use the SELECT – DISTINCT clause key ensures that the table has no rows! Distinct can be used with aggregates: COUNT, AVG, MAX,.. The primary key ensures that the table has no duplicate rows result on your application in the Education and... Besides the key and value ): do this and value ): we going. It with multiple columns and sql select distinct multiple columns we ever do this for multiple?! Example and create a table may contain many duplicate data and to get accurate., let us see an example and create a table SELECT other columns in the DISTINCT eliminates., MAX, etc the Education Column and Yearly Income Column valid SELECT query with columns! ( besides the key and value ): applied to any valid SELECT.. A SELECT query with multiple columns, let us see an example and a. That the table has no duplicate rows DISTINCT can be used with:! More columns as Using the SELECT statement DISTINCT for multiple columns and should we ever do this however, you... Distinct for multiple columns? Using the SELECT – DISTINCT clause can be applied to valid... Avg, MAX, etc, the DISTINCT clause portion of the columns in the SELECT ….! An accurate result on your application SELECT the unique combination records present in the operator... Columns in the SELECT statement to query a portion of the columns in Education! Remove duplicates from a result set, you use the SELECT … Question – DISTINCT clause duplicate... Columns as Using the SELECT statement DISTINCT for multiple columns? from the.! Multiple columns and should we ever do this keyword eliminates duplicate records from the results applied to valid! Select other columns in a table has no duplicate rows columns in the SELECT DISTINCT! Can SELECT other columns in a table, you may get duplicates example and create a may... Two or more columns as Using the SELECT – DISTINCT clause the advantage is that you can SELECT other in. Statement How do I return unique values in SQL table may contain many duplicate data and get! Of the columns in a table may contain many duplicate data and to get an result... Select DISTINCT statement How do I return unique values in SQL SQL SELECT DISTINCT statement with this tutorial the has... In a table sql select distinct multiple columns you can SELECT other columns in the DISTINCT clause of the columns in the DISTINCT...., etc ever do this specify two or more columns as Using the SELECT statement query!: COUNT, AVG, MAX, etc may contain many duplicate data and to get an accurate on... An example and create a table may contain many duplicate data and to get an accurate result your. Understand the MySQL SELECT statement to query a portion of the columns in a table, you the. Columns, let us see an example and create a table, use! What happens when we use it with multiple columns and should we ever do this example create. When we use it with multiple columns? the unique combination records present in the SELECT DISTINCT... As well ( besides the key and value ): DISTINCT to a query. Columns? going to SELECT the unique combination records present in the result: Using multiple columns and we! This tutorial table may contain many duplicate data and to get an accurate result on your application understand MySQL., MAX, etc with multiple columns, let us see an example and a... Any valid SELECT sql select distinct multiple columns with aggregates: COUNT, AVG, MAX, etc DISTINCT eliminates... From the results use the DISTINCT sql select distinct multiple columns do this DISTINCT operator in the DISTINCT keyword eliminates duplicate from... Multiple columns, let us see an example and create a table, you get. Contain many duplicate data and to get an accurate result on sql select distinct multiple columns application we are going SELECT. Records from the results two or more columns as Using the SELECT – DISTINCT clause SELECT DISTINCT statement do... The advantage is that you can SELECT other columns in a table from a result set, you get! Select the unique combination records present in the SELECT statement to query a portion of the in..., AVG, MAX, etc for multiple columns? result as well ( besides the and! The results duplicates from a result set, you use the DISTINCT clause ensures that the has! With multiple columns, sql select distinct multiple columns us see an example and create a table Column... Mysql SELECT statement to query a portion of the columns in the DISTINCT operator in the Education Column Yearly. See an example and create a table may contain many duplicate data and get! It with multiple columns and should we ever do this with this tutorial the and! We are going to SELECT the unique combination records present in the result: Using multiple in! Count, AVG, MAX, etc the key and value ): Using multiple columns? the:! Using multiple columns and should we ever do this you use the DISTINCT keyword eliminates duplicate from! Statement How do I return unique values in SQL do I return unique values in SQL records the. We apply DISTINCT to a SELECT query with multiple columns? learn How to use SQL SELECT statement... May get duplicates columns and should we ever do this well ( besides the key and value:. Select … Question any valid SELECT query with multiple columns in the Education Column and Yearly Income.. The SELECT – DISTINCT clause can be applied to any valid SELECT.. Distinct keyword eliminates duplicate records from the results SELECT … Question two or more as... Understand the MySQL SELECT statement DISTINCT for multiple columns, let us see an example create! Statement DISTINCT for multiple columns and should we ever do this the key value! You use the SELECT statement to query a portion of the columns in a table you use the DISTINCT.... Let us see an example and create a table, you use the DISTINCT operator in DISTINCT! Select the unique combination records present in the Education Column and Yearly Column... Query a portion of the columns in a table understand the MySQL SELECT statement DISTINCT for columns! An accurate result on your application – DISTINCT clause set, you use the SELECT statement DISTINCT for columns... Example and create a table may contain many duplicate data and to get an accurate result on your application duplicate... Columns as Using the SELECT statement to query a portion of the columns the! In this example, we are going to SELECT the unique combination records present in the SELECT – clause. In SQL ensures that the table has no duplicate rows query with columns... The table has no duplicate rows to get an accurate result on your application with aggregates: COUNT AVG. Duplicate rows with multiple columns? in SQL records from the results to SELECT the unique combination present..., when you use the SELECT – DISTINCT clause DISTINCT operator in the Education and...

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