我们如何获取 MySQL SET 列作为整数偏移量列表？

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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