FIND_IN_SET()
The FIND_IN_SET() function returns the position of a string within a list of strings.
Syntax
FIND_IN_SET(string, string_list)
Parameter Values
string - Required. The string to search for string_list - Required. The list of string values to be searched (separated by commas)
Return Values
If string is not found in string_list, this function returns 0 If string or string_list is NULL, this function returns NULL If string_list is an empty string (""), this function returns 0
Example
SELECT FIND_IN_SET("q", "s,q,l");