在 MySQL 中将一列的值复制到新表的最简单方法是什么?
对此,请使用 AS 选择语句。让我们首先创建一个表 -
mysql> create table DemoTable1 ( Score int ); Query OK, 0 rows affected (1.22 sec)
使用插入命令在表中插入一些记录 -
mysql> insert into DemoTable1 values(89); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1 values(98); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1 values(91); Query OK, 1 row affected (0.24 sec)
使用选择语句从表中显示所有记录 -
mysql> select *from DemoTable1;
这将产生以下输出 -
+-------+ | Score | +-------+ | 89 | | 98 | | 91 | +-------+ 3 rows in set (0.00 sec)
以下是要将一列的值复制到新表的查询 -
mysql> create table DemoTable2( StudentScore int )AS select Score AS StudentScore from DemoTable1; Query OK, 3 rows affected (0.81 sec) Records: 3 Duplicates: 0 Warnings: 0
让我们再次检查表记录 -
mysql> select StudentScore from DemoTable2;
这将产生以下输出 -
+--------------+ | StudentScore | +--------------+ | 89 | | 98 | | 91 | +--------------+ 3 rows in set (0.00 sec)
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