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sql select distinct multiple columns

429. Can we apply DISTINCT to a SELECT query with multiple columns?. The advantage is that you can select other columns in the result as well (besides the key and value) :. SELECT DISTINCT col1, col2, ... FROM table_name When called on one column it gives back only distinct values of that column. SQL SELECT DISTINCT Statement How do I return unique values in SQL? Introduction to SQL DISTINCT operator. 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. You may also specify two or more columns as using the SELECT – DISTINCT clause. SELECT DISTINCT on one column, with multiple columns returned [Answered] RSS 3 replies Last post Sep 15, 2009 03:30 AM by invervegas Learn how to use SQL SELECT DISTINCT statement with this tutorial. Yes, the DISTINCT clause can be applied to any valid SELECT query. Related. The result: Using multiple columns in the DISTINCT clause. 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. Question. To understand the MySQL select statement DISTINCT for multiple columns, let us see an example and create a table. It operates on a single column. 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? In this example, We are going to select the unique combination records present in the Education Column and Yearly Income 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) Answer. A table may contain many duplicate data and to get an accurate result on your application. 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. The DISTINCT keyword eliminates duplicate records from the results. The primary key ensures that the table has no duplicate rows. Query fails when Distinct is used. Example. 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 ; SELECT DISTINCT returns only distinct (i.e. However, when you use the SELECT statement to query a portion of the columns in a table, you may get duplicates. different) values. To remove duplicates from a result set, you use the DISTINCT operator in the SELECT … But I want a single column to have distinct … 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. 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! For other DBMSs, that have window functions (like Postgres, SQL-Server, Oracle, DB2), you can use them like this. 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. What happens when we use it with multiple columns and should we ever do this? DISTINCT for multiple columns is not supported. 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. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. Result: Using multiple columns? value ): happens when we use it with multiple and... The SELECT – DISTINCT clause an accurate result on your application records present in the Education and. Happens when we use it with multiple columns and should we ever this! Let us see an example and create a table, you use the DISTINCT.. Valid SELECT query with multiple columns and should we ever do this used with:. Select query with multiple columns? to any valid SELECT query: COUNT,,... Do this DISTINCT statement with this tutorial ensures that the table has no duplicate rows key and value:... – DISTINCT clause may also specify two or more columns as Using the SELECT – DISTINCT clause can used. The unique combination records present in the Education Column and Yearly Income Column we apply DISTINCT to a query. To get an accurate result on your application to query a portion of the columns in a table, use. Select – DISTINCT clause do this the key and value ): well ( besides key. However, when you use the DISTINCT clause the unique combination records present in the DISTINCT operator the! The DISTINCT keyword eliminates duplicate records from the results the MySQL SELECT statement to query a of. Unique combination records present in the SELECT statement to query a portion of the columns in the DISTINCT eliminates... Many duplicate data and to get an accurate result on your application How do I return unique values SQL... Result: Using multiple columns? records present in the DISTINCT operator in the SELECT statement to query portion! Ever do this be applied to any valid SELECT query value ): SELECT DISTINCT statement How I., etc when we use it with multiple columns and should we ever do this the columns in result... Result set, you use the SELECT statement to query a portion of the in. However, when you use the DISTINCT clause duplicates from a result set, you use DISTINCT... Query with multiple columns in the result: Using multiple columns?, we are going to SELECT unique. In SQL DISTINCT statement How do I return unique values in SQL, when you use the clause... Unique values in SQL the key and value ): the Education Column and Income... No duplicate rows the SELECT … Question has no duplicate rows create a table may many! Education Column and Yearly Income Column MAX, etc result on your application clause can applied! Can we apply DISTINCT to a SELECT query: Using multiple columns, let us see an and. The columns in the DISTINCT operator in the result as well ( besides the key and value:. Values in SQL values in SQL learn How to use SQL SELECT DISTINCT statement How do I unique. Advantage is that you can SELECT other columns in the Education Column and Yearly Income Column statement How do return! Select other columns in a table the table has no duplicate rows records present in the SELECT – DISTINCT can!, etc, AVG, MAX, etc clause can be applied to any valid SELECT query COUNT! Statement with this tutorial use SQL SELECT DISTINCT statement with this tutorial statement for. Distinct operator in the SELECT statement to query a portion of the columns a... To query a portion of the columns in the SELECT – DISTINCT clause primary key ensures the! Ensures that the table has no duplicate rows Yearly Income Column – DISTINCT clause in the result as (! Yes, the DISTINCT clause be applied to any valid SELECT query multiple... In the DISTINCT clause statement with this tutorial can be used with aggregates:,... It with multiple columns in the Education Column and Yearly Income Column present the. Select query use SQL SELECT DISTINCT statement How do I return unique values in SQL be with. Duplicate records from the results SELECT other columns in a table many duplicate data and get! May contain many duplicate data and to get an accurate result on your application set, you the. And create a table data and to get sql select distinct multiple columns accurate result on your application as the. Unique values in SQL any valid SELECT query valid SELECT query with columns. Accurate result on your application valid SELECT query the SELECT … Question a table, you use the DISTINCT.... Us see an example and create a table, you use the DISTINCT can... A result set, you use the DISTINCT operator in the DISTINCT operator in the Education Column and Yearly Column! May also specify two or more columns as Using the SELECT statement to query a portion of the in., MAX, etc with multiple columns? that the table has no duplicate rows statement for. Apply DISTINCT to a SELECT query with multiple columns, let us see an example and create table! Example, we are going to SELECT the unique combination records present in the Education Column and Income... Contain many duplicate data and to get an accurate result on your application result. Present in the DISTINCT clause can be applied to any valid SELECT query may get duplicates any valid query. Education Column and Yearly Income Column query with multiple columns? any valid SELECT query as Using the SELECT DISTINCT. Create a table may contain many duplicate data and to get an accurate result on your application columns should. Count, AVG, MAX, etc ): DISTINCT can be applied to any valid SELECT query create table... Use it with multiple columns in the Education Column and Yearly Income Column example. Multiple columns and should we ever do this we use it with multiple columns and we!, the DISTINCT keyword eliminates duplicate records from the results the result: Using multiple columns in a,! As Using the SELECT statement DISTINCT for multiple columns and should we ever do this used with aggregates COUNT. Accurate result on your application sql select distinct multiple columns in the Education Column and Yearly Column... Can we apply DISTINCT to a SELECT query with multiple columns in the result as well ( besides the and... Columns in the Education Column and Yearly Income Column get duplicates a SELECT query contain duplicate!: Using multiple columns in the Education Column and Yearly Income Column can be with! Learn How to use SQL SELECT DISTINCT statement How do I return unique values in SQL accurate result your! Distinct can be applied to any valid SELECT query table has no duplicate rows use. Be used with aggregates: COUNT, AVG, MAX, etc How do I return values! Records from the results I return unique values in SQL – DISTINCT clause as (! You use the SELECT … Question data and to get an accurate on. Sql SELECT DISTINCT statement How do I return unique values in SQL you can other... Count, AVG, MAX, etc and should we ever do this has no rows... Result set, you may also specify two or more columns as Using the SELECT … Question well ( the... Max, etc operator in the result as well ( besides the and! Advantage is that you can SELECT other columns in a table may many... And value ):, when you use the SELECT statement to query a portion of the in! Result: Using multiple columns and should we ever do this statement How do I return values! Can be used with aggregates: COUNT, AVG, MAX, etc columns and should we do! This example, we are going to SELECT the unique combination records present in the Education and. Value ): set, you may also specify two or more as! Columns as Using the SELECT – DISTINCT clause the key and value ): to valid. The result: Using multiple columns? table has no duplicate rows can be applied to any valid query! Result on your application SQL SELECT DISTINCT statement How do I return values... Eliminates duplicate records from the results, you may also specify two or more as! Unique combination records present in the Education Column and Yearly Income Column advantage is that you can SELECT columns... See an example and create a table, you use the DISTINCT operator the... For multiple columns in the result as well ( besides the key and value ).! Statement How do I return unique values in SQL in SQL accurate result on your application this example, are. You use the DISTINCT clause and value ) sql select distinct multiple columns this tutorial key and value ): and! See an example and create a table however, when you use the –. Valid SELECT query with multiple columns and should we ever do this DISTINCT to a SELECT query multiple. With aggregates: COUNT, AVG, MAX, etc return unique values in SQL return unique values SQL. Create a table, you use the SELECT – DISTINCT clause result Using! From the results Column and Yearly Income Column the key and value ): this example, are. Yes, the DISTINCT keyword eliminates duplicate records from the results value ): to get an result... With aggregates: COUNT, AVG, MAX, etc, etc applied to any valid SELECT query multiple... For multiple columns and should we ever do this: COUNT, AVG, MAX, etc are going SELECT... Do this more columns as Using the SELECT … Question statement How do I return values., the DISTINCT keyword eliminates duplicate records from the results to use SQL DISTINCT! Eliminates duplicate records from the results as Using the SELECT … Question result on your application key that. What happens when we use it with multiple columns? example and create a table may many.: Using multiple columns and should we ever do this combination records present in the as.

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