MySQL笔记之别名的使用

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

复制代码 代码如下:

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|
+------+-----------+--------------+-------------+
row in set (0.00 sec)

为字段取别名

复制代码 代码如下:

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|
+---------------+-----------------+
rows in set (0.00 sec)