我们如何获取MySQL SET列作为整数偏移量列表？
我们可以借助MAKE_SET()函数获取MySQLSET列值作为整数偏移量列表。为了使其理解，我们正在创建一个名为“set_testing”的表，如下所示：
mysql> Create table set_testing( id INT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT, table SET('ABC','ABD','GHF') NOT NULL);
mysql> Insert into set_testing (table) values('1');
mysql> Insert into set_testing (table) values('2');
mysql> Insert into set_testing (table) values('3');
mysql> Insert into set_testing (table) values('4');
mysql> Select * from set_testing;
+----+---------+
| id | table |
+----+---------+
| 1 | ABC |
| 2 | ABD |
| 3 | ABC,ABD |
| 4 | GHF |
+----+---------+
4 rows in set (0.00 sec)现在，以下查询将获取MySQLSET列作为整数偏移量的列表-
mysql> Select MAKE_SET(types+0,'1','2','3') as output from doctypes1; +--------+ | output | +--------+ | 1 | | 2 | | 1,2 | | 3 | +--------+ 4 rows in set (0.00 sec)