SQL Select Distinct

















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SQL Select Distinct




The DISTINCT keyword is used to return only distinct (different)
values.


The DISTINCT Keyword
The SQL SELECT statement returns information from table columns. But what if we only want to select
distinct elements? 
With SQL, all we need to do is to add a DISTINCT keyword to the SELECT
statement with the following syntax:



SELECT DISTINCT column-name(s) FROM table-name






Example: Select Companies from Order Table
Example: Simple Table of Purchase Orders:


Company
OrderNumber


Sega
3412


W3Schools
2312


Trio
4678


W3Schools
6798


This SQL statement:



SELECT Company FROM Orders



Will return this result:


Company


Sega


W3Schools


Trio


W3Schools



Note that the company W3Schools is listed twice in the result. Sometimes we
don't want that.


Example: Select Distinct Companies from Orders

This SQL statement:



SELECT DISTINCT Company FROM Orders



Will return this result:


Company


Sega


W3Schools


Trio


Now the company W3Schools is listed only once in the result. Sometimes that
is what we want.




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