SUBSTR function returns the sub string within a string.

Syntax:

SUBSTR(string, start_position, length)

or

SUBSTRING (string, start_position, length)

In MySQL both SUBSTR and SUBSTRING will work. SUBSTR is in ANSI standard.

Examples:-

mysql> select SUBSTR(‘sqlandplsql.com’,1,11);
will return  –  sqlandplsql

mysql> select SUBSTRING(‘sqlandplsql.com’,1,11);
will return  –  sqlandplsql

mysql> select SUBSTR(‘sqlandplsql.com’,2);
will return  –  qlandplsql
If you omit the length it will default to full string length.

mysql> select SUBSTR(‘sqlandplsql.com’,-3);
will return  –  com

Some more examples

select substr(‘sqlandplsql.com’,1,null); —> null
select substr(‘sqlandplsql.com’,null,null); —> null
select substr(‘sqlandplsql.com’,0,0); —>
select substr(‘sqlandplsql.com’,1,-2); —>
select substr(‘sqlandplsql.com’,0,3); —>