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root@localhost : test 01:14:58>select * from cs;
+-------+----------+
| a | b |
+-------+----------+
| 123 | 123,234 |
| 11 | 12,13,32 |
| 54,43 | 54 |
+-------+----------+
3 rows in set (0.00 sec)
root@localhost : test 01:15:52>select * from cs where find_in_set(a,b);
+------+---------+
| a | b |
+------+---------+
| 123 | 123,234 |
+------+---------+
1 row in set (0.00 sec)