Tutorial SQL - SQL DISTINCT

SQL DISTINCT
Using SELECT in SQL allows you to read all data from one or more columns. This command can potentially display duplicate rows. To avoid redundancies in the results simply add DISTINCT after the word SELECT.

Basic command
The basic use of this command is then to perform the following query:

Code:

SELECT DISTINCT my_column
FROM table_name

This query selects the "my_column" field in the "table_name" table, avoiding duplicate returns.

Query for Oracle
For the Oracle Database Management System (DBMS), this query is replaced by the "UNIQUE" command:

Code:

SELECT UNIQUE my_column
FROM table_name