我们怎样才能借助 MySQL 自计算输出向表中插入值?
借助 MySQL 返回的自计算输出,我们可以在表中插入值。这样一来,我们就无需使用虚拟“dual”表。语法可以如下所示:
INSERT INTO table_name(column1,column2,column3,…) Select value1,value2,value3,…;
示例
在下面的示例中,我们借助 MySQL 自计算输出在“testing”表中插入了值。
mysql> Create table testing(id int, item_name varchar(10)); Query OK, 0 rows affected (0.15 sec) mysql> Insert into testing (id,item_name)Select 1,'Book'; Query OK, 1 row affected (0.11 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> Insert into testing (id,item_name)Select 2,'Pen'; Query OK, 1 row affected (0.11 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> select * from testing; +------+-----------+ | id | item_name | +------+-----------+ | 1 | Book | | 2 | Pen | +------+-----------+ 2 rows in set (0.00 sec)
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