### FIND_IN_SET Function in MySQL

FIND_IN_SET Returns a value in the range of 1 to N if the string str is in the string list strlist consisting of N substrings. A string list is a string composed of substrings separated by “,” characters. If the first argument is a constant string and the second is a column of type SET, the FIND_IN_SET() function is optimized to use bit arithmetic. Returns 0 if str is not in strlist or if strlist is the empty string. Returns NULL if either argument is NULL. This function does not work properly if the first argument contains a comma (“,”) character.

For

`mysql> SELECT FIND_IN_SET('b','a,b,c,d');`

-> 2For

`SELECT *`

FROM a

WHERE a.column IN (1, 2, 3)

*can be written to:*

`SELECT *`

FROM a

WHERE FIND_IN_SET(a.column, '1,2,3')

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