MySQL学习笔记17：别名

在查询时，可以为表和字段取一个别名。这个别名可以代替其指定的表和字段

 

为表取别名

mysql> SELECT * FROM department d
    -> WHERE d.d_id=1001;
+------+-----------+--------------+-------------+
| d_id | d_name    | function     | address     |
+------+-----------+--------------+-------------+
| 1001 | 科技部    | 研发产品       | 3号楼5层     |
+------+-----------+--------------+-------------+
1 row in set (0.00 sec)

这里为department表取了一个别名为d

 

为字段取别名

mysql> SELECT d_id AS department_id, d_name AS department_name
    -> FROM department;
+---------------+-----------------+
| department_id | department_name |
+---------------+-----------------+
|          1001 | 科技部          |
|          1002 | 生产部          |
|          1003 | 销售部          |
+---------------+-----------------+
3 rows in set (0.00 sec)

此处语法与上面类似，只不过加了AS