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MySQL | FIND_IN_SET method

schedule Aug 10, 2023
Last updated
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MySQL
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MySQL's FIND_IN_SET(~) method returns the position of the first occurrence of a string in a string list.

Parameters

1. str | string

The string we are trying to find in strlist.

2. strlist | string list

A string list composed of substrings separated by commas.

Return value

Case

Return value

str exists in strlist

Position of first occurrence of str in strlist

str does not exist in strlist

0

Empty strlist

0

NULL argument

Examples

Basic usage

To return position of 'b' in the string list 'a,b,c,d':

SELECT FIND_IN_SET('b','a,b,c,d');
+----------------------------+
| FIND_IN_SET('b','a,b,c,d') |
+----------------------------+
| 2 |
+----------------------------+

'b' is the second substring in the string list 'a,b,c,d'.

To return position of 'b' in the string list 'a,b,c,d,b':

SELECT FIND_IN_SET('b','a,b,c,d,b');
+------------------------------+
| FIND_IN_SET('b','a,b,c,d,b') |
+------------------------------+
| 2 |
+------------------------------+

Despite there being two occurrences of 'b' in the string list, we return the position of the first occurrence.

No occurrence in strlist

To return position of 'b' in the string list 'a,c,d':

SELECT FIND_IN_SET('b','a,c,d');
+--------------------------+
| FIND_IN_SET('b','a,c,d') |
+--------------------------+
| 0 |
+--------------------------+

0 is returned as 'b' does not exist in string list 'a,c,d'.

Empty strlist

To return position of 'b' in the string list '':

SELECT FIND_IN_SET('b','');
+---------------------+
| FIND_IN_SET('b','') |
+---------------------+
| 0 |
+---------------------+

0 is returned as 'b' does not exist in string list ''.

NULL argument

To return position of 'b' in the string list NULL:

SELECT FIND_IN_SET('b', NULL);
+------------------------+
| FIND_IN_SET('b', NULL) |
+------------------------+
| NULL |
+------------------------+

NULL is returned as one of the arguments is NULL.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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