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select product_id,product_name,ab.product_type_id,group_concat(product_type_name) as typename from ab,ac where instr(ab.product_type_id,ac.product_type_id) group by product_id,product_name;
+------------+--------------+-----------------+-----------------+
| product_id | product_name | product_type_id | typename |
+------------+--------------+-----------------+-----------------+
| 1 | 产品A | 1,2 | 类别1,类别2 |
| 2 | 产品B | 2,3 | 类别3,类别2 |
+------------+--------------+-----------------+-----------------+
root@localhost : test 04:47:33>select * from ab;
+------------+--------------+-----------------+
| product_id | product_name | product_type_id |
+------------+--------------+-----------------+
| 1 | 产品A | 1,2 |
| 2 | 产品B | 2,3 |
+------------+--------------+-----------------+
2 rows in set (0.00 sec)
root@localhost : test 04:47:42>select * from ac;
+-----------------+-------------------+
| product_type_id | product_type_name |
+-----------------+-------------------+
| 1 | 类别1 |
| 2 | 类别2 |
| 3 | 类别3 |
+-----------------+-------------------+
3 rows in set (0.00 sec)
root@localhost : test 04:47:44>select product_id,product_name,group_concat(product_type_name) as type from ab,ac where instr(ab.product_type_id,ac.product_type_id) group by product_id,product_name;
+------------+--------------+-----------------+
| product_id | product_name | type |
+------------+--------------+-----------------+
| 1 | 产品A | 类别1,类别2 |
| 2 | 产品B | 类别2,类别3 |
+------------+--------------+-----------------+
2 rows in set (0.00 sec)