借助 MAKE_SET() 函數,我們可以以整數偏移清單的形式取得 MySQL SET 列值。為了方便理解,我們建立一個名為「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)
現在,以下查詢將取得 MySQL SET 列作為整數偏移量清單 -
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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