SUBSTR() FUNCTION
The MySQL SUBSTR function is used to extract a substring from a string. The various versions of MySQL support the SUBSTR function, namely, MySQL 5.7, MySQL 5.6, MySQL 5.5, MySQL 5.1, MySQL 5.0 and MySQL 4.1.1.
Syntax 1:
SUBSTR( string, start_position, length )
Syntax 2:
SUBSTR( string FROM start_position FOR length )
Parameters:
string: It is used to specify the string to search.
start_position: It is used to specify the position to begin extraction.
length: It is an optional parameter that is used to specify the number of characters to extract.
Example 1:
mysql> SELECT SUBSTR ( 'HELLO WORLD', 7 );
Output:
‘WORLD’
Explanation:
The substring is extracted from the 7th position till the end.
Example 2:
mysql> SELECT SUBSTR ( 'HELLO WORLD', 7, 5 );
Output:
‘WORLD’
Explanation:
The substring is extracted from the 7th position for 5 characters.
Example 3:
mysql> SELECT SUBSTR ( 'HELLO WORLD' FROM 7 );
Output:
‘WORLD’
Explanation:
The substring is extracted from the 7th position till the end.
Example 4:
mysql> SELECT SUBSTR ( 'HELLO WORLD' FROM 7 FOR 5 );
Output:
‘WORLD’
Explanation:
The substring is extracted from the 7th position for 5 characters.