我们如何获取 MySQL SET 列作为整数偏移量列表？

借助 MAKE_SET() 函数，我们可以以整数偏移量列表的形式获取 MySQL SET 列值。为了便于理解，我们创建一个名为“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);
Query OK, 0 rows affected (0.08 sec)

mysql> Insert into set_testing (table) values('1');
Query OK, 1 row affected (0.06 sec)

mysql> Insert into set_testing (table) values('2');
Query OK, 1 row affected (0.06 sec)

mysql> Insert into set_testing (table) values('3');
Query OK, 1 row affected (0.02 sec)

mysql> Insert into set_testing (table) values('4');
Query OK, 1 row affected (0.02 sec)

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 MySQL SET 列作为整数偏移量列表 -

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)

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