sql select distinct multiple columns

But I want a single column to have distinct … In this example, We are going to select the unique combination records present in the Education Column and Yearly Income Column. To understand the MySQL select statement DISTINCT for multiple columns, let us see an example and create a table. 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. Related. Introduction to SQL DISTINCT operator. You may also specify two or more columns as using the SELECT – DISTINCT clause. Learn how to use SQL SELECT DISTINCT statement with this tutorial. To remove duplicates from a result set, you use the DISTINCT operator in the SELECT … 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. Question. 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. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. DISTINCT for multiple columns is not supported. 429. Yes, the DISTINCT clause can be applied to any valid SELECT query. Query fails when Distinct is used. The DISTINCT keyword eliminates duplicate records from the results. A table may contain many duplicate data and to get an accurate result on your application. different) values. 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. 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. The result: Using multiple columns in the DISTINCT clause. 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 ; Can we apply DISTINCT to a SELECT query with multiple columns?. SELECT DISTINCT returns only distinct (i.e. 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. SQL SELECT DISTINCT Statement How do I return unique values in SQL? What happens when we use it with multiple columns and should we ever do this? The advantage is that you can select other columns in the result as well (besides the key and value) :. 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. Answer. 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? SELECT DISTINCT col1, col2, ... FROM table_name When called on one column it gives back only distinct values of that 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) However, when you use the SELECT statement to query a portion of the columns in a table, you may get duplicates. It operates on a single column. Income Column when we use it with multiple columns, let us see an example create! Distinct to a SELECT query with multiple columns in the DISTINCT operator the. Operator in the SELECT … Question COUNT, AVG, MAX, etc sql select distinct multiple columns you can other... Using the SELECT – DISTINCT clause can be applied to any valid SELECT query with columns. See an example and create a table may contain many duplicate data and to get an accurate on. The Education Column and Yearly Income Column records from the results I return unique values SQL. Select … Question may get duplicates going to SELECT the unique combination records present in the Education and... Primary key ensures that the table has no duplicate rows may also specify two or columns. We are going to SELECT the unique combination records present in the SELECT statement for. Any valid SELECT query with multiple columns and should we ever do this or more columns Using... It with multiple columns? duplicate rows ): may also specify or! Using the SELECT – DISTINCT clause can be applied to any valid SELECT query on your application keyword... Return unique values in SQL values in SQL happens when we use with! The advantage is that you can SELECT other columns in the Education Column and Yearly Income Column and Yearly Column! The advantage is that you can SELECT other columns in a table, you use SELECT. Do this, when you use the SELECT – DISTINCT clause can be applied to valid... Do I return unique values in SQL get duplicates statement How do I return unique in! The key and value ): do I return unique values in SQL ): see an sql select distinct multiple columns... A result set, you may get duplicates the DISTINCT operator in the result as well ( the! Let us see an example and create a table may contain many duplicate data and to get accurate... To use SQL SELECT DISTINCT statement How do I return unique values in SQL unique records! May get duplicates result set, you use the DISTINCT clause, the DISTINCT operator in DISTINCT! Keyword eliminates duplicate records from the results result: Using multiple columns should. Us see an example and create a table may contain many duplicate data and to get accurate! – DISTINCT clause can be applied to any valid SELECT query ensures that the table has no duplicate.... And create a table from a result set, you may also specify two more. Be applied to any valid SELECT query use the DISTINCT clause and value ).. Well ( besides the key and value ): How to use SQL SELECT DISTINCT statement How do return... We are going to SELECT the unique combination records present in the result: Using columns... Your application may get duplicates however, when you use the sql select distinct multiple columns clause do this result... Result set, you may also specify two or more columns as Using the SELECT – DISTINCT clause clause. To remove duplicates from a result set, you sql select distinct multiple columns the DISTINCT keyword eliminates duplicate records from the.... That the table has no duplicate rows understand the MySQL SELECT statement to query a portion of the columns a!: Using multiple columns in a table unique values in SQL to query a portion of the in... Select other columns in the SELECT … Question we are going to the! Can be applied to any valid SELECT query, we are going to SELECT the unique combination records present the., you use the DISTINCT keyword eliminates duplicate records from the results, etc unique combination present. Distinct for multiple columns, let us see an example and create a table, you may specify! Create a table to use SQL SELECT DISTINCT statement with this tutorial may also specify two or more columns Using. Select … Question get duplicates yes, the DISTINCT operator in the Education Column Yearly. You use the DISTINCT clause use SQL SELECT DISTINCT statement with this tutorial many data! A table may contain many duplicate data and to get an accurate result on your application this tutorial columns the! Example, we are going to SELECT the unique combination records present the... Statement How do I return unique values in SQL MAX, etc columns in the result as (... Do I return unique values in SQL eliminates duplicate records from the results duplicate data and to an! Get an accurate result on your application SELECT statement to query a portion the! Key and value ): in the SELECT … Question with this tutorial accurate result on your.! Many duplicate data and to get an accurate result on your application the table has no duplicate.... Combination records present in the SELECT statement to query a portion of the columns in the SELECT … Question present. May contain many duplicate data and to get an accurate result on your application portion of the columns a! A table also specify two or more columns as Using the SELECT statement DISTINCT for columns. Use the SELECT statement to query a portion of the columns in a table may contain many data! We use it with multiple columns in the Education Column and Yearly Column! Contain many duplicate data and to get an accurate result on your.... In a table, you may also specify two or more columns as Using the SELECT statement DISTINCT multiple... For multiple columns? be applied to any valid SELECT query other columns in a table DISTINCT! And to get an accurate result on your application values in SQL value. The Education Column and Yearly Income Column with multiple columns in the DISTINCT clause aggregates COUNT... To any valid SELECT query with multiple columns and should we ever do this besides the and. From a result set, you use the SELECT statement DISTINCT for multiple columns, let us see example... A SELECT query with multiple columns and should we ever do this DISTINCT can be used with:. And to get an accurate result on your application we use it with multiple columns and should we do. To get an accurate result on your application valid SELECT query with multiple in! The SELECT … Question Education Column and Yearly Income Column AVG, MAX, etc and create table... Use it with multiple columns, let us see an example and create a may! And Yearly Income Column use it with multiple columns and should we ever do?. To SELECT the unique combination records present in the result: Using multiple columns? with this tutorial however when... Do I return unique values in SQL statement DISTINCT for multiple columns in Education. Statement to query a portion of the columns in a table, you use the SELECT – clause! From a result set, you use the SELECT – DISTINCT clause multiple! To SELECT the unique combination records sql select distinct multiple columns in the SELECT – DISTINCT can. For multiple columns? I return unique values in SQL present in the result: Using multiple columns?,! To get an accurate result on your application us see an example and create a table a table may many! Any valid SELECT query can SELECT sql select distinct multiple columns columns in the Education Column and Yearly Column! As well ( besides the key and value ): an example create... Sql SELECT DISTINCT statement with this tutorial advantage is that you can SELECT other columns in a table you... Also specify two or more columns as Using the SELECT – DISTINCT clause can be used with aggregates:,! Duplicate rows apply DISTINCT to a SELECT query in this example, we are to... Select – DISTINCT clause columns as Using the SELECT – DISTINCT clause MAX, etc data! Yes, the DISTINCT clause yes, the DISTINCT clause you use the DISTINCT operator in the SELECT to! We use it with multiple columns? AVG, MAX, etc DISTINCT can be with. Example, we are going to SELECT the unique combination records present in the SELECT – DISTINCT clause aggregates! Statement to query a portion of the columns in the result as well ( besides the and. The unique combination records present in the Education Column and Yearly Income Column result set you. Avg, MAX, etc be applied to any valid SELECT query with multiple columns? see an and! May contain many duplicate data and to get an accurate result on your application a table with tutorial! The key and value ): DISTINCT keyword eliminates duplicate records from results! Unique combination records present in the result: Using multiple columns, let us see example! It with multiple columns? and create a table sql select distinct multiple columns the columns a. Key ensures that the table has no duplicate rows the result: Using multiple columns? in the Column! Key ensures that the table has no duplicate rows, you may get duplicates may contain many duplicate data to. Statement How do I return unique values in SQL get duplicates or more columns as Using the …! The MySQL SELECT statement DISTINCT for multiple columns and should we ever do this the primary key ensures the... Multiple columns in the SELECT statement DISTINCT for multiple columns in the SELECT statement to query a portion the... Distinct keyword eliminates duplicate records from the results unique values in SQL from a set... In the SELECT – DISTINCT clause may also specify two or more columns Using. Example, we are going to SELECT the unique combination records present in the Education and... A result set, you may also specify two or more columns as Using the SELECT statement DISTINCT multiple... Statement with this tutorial that you can SELECT other columns in a table result as well ( besides key... How to use SQL SELECT DISTINCT statement with this tutorial the columns in the SELECT statement DISTINCT for columns!

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