SELECT * FROM tbl_name WHERE FIND_IN_SET('value',set_col)>0;
mysql>
mysql> CREATE TABLE myset (col SET('a', 'b', 'c', 'd'));
Query OK, 0 rows affected (0.01 sec)
mysql> INSERT INTO myset (col) VALUES ('a,d'),
-> ('d,a'),
-> ('a,d,a'),
-> ('a,d,d'),
-> ('d,a,d');
Query OK, 5 rows affected (0.00 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql> SELECT col FROM myset;
+------+
| col |
+------+
| a,d |
+------+
5 rows in set (0.00 sec)
mysql>
mysql> select * from myset where find_in_set('a', col) > 0;
+------+
| col |
+------+
| a,d |
+------+
5 rows in set (0.00 sec)
mysql>
mysql> drop table myset;
Query OK, 0 rows affected (0.00 sec)
mysql>