如何从包含学生记录的 MySQL 表更改列名?
若要更改列名,请在列名后使用 AS 关键字。让我们首先创建一个表 -
mysql> create table DemoTable ( Id int, StudentFirstNameInCollege varchar(100) ); Query OK, 0 rows affected (0.68 sec)
使用插入命令在表中插入一些记录 -
mysql> insert into DemoTable values(100,'Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(101,'Bob'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(102,'David'); Query OK, 1 row affected (0.21 sec)
使用 select 语句显示表中的所有记录 -
mysql> select *from DemoTable;
这将产生以下输出 -
+------+---------------------------+ | Id | StudentFirstNameInCollege | +------+---------------------------+ | 100 | Chris | | 101 | Bob | | 102 | David | +------+---------------------------+ 3 rows in set (0.00 sec)
以下是使用 AS 关键字更改 MySQL 中某个列名称的查询 -
mysql> select Id,StudentFirstNameInCollege AS Name from DemoTable;
这将产生以下输出 -
+------+-------+ | Id | Name | +------+-------+ | 100 | Chris | | 101 | Bob | | 102 | David | +------+-------+ 3 rows in set (0.00 sec)
广告