如何在MySQL中SELECT *和重命名列？

首先让我们创建一个表 –

mysql> create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Name varchar(20),
   Age int
   );
Query OK, 0 rows affected (1.15 sec)

使用插入命令在表中插入记录 –

mysql> insert into DemoTable(Name,Age) values('John',21);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name,Age) values('Carol',24);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Name,Age) values('David',22);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(Name,Age) values('Sam',23);
Query OK, 1 row affected (0.23 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 | Name  | Age  |
+----+-------+------+
| 1  | John  | 21   |
| 2  | Carol | 24   |
| 3  | David | 22   |
| 4  | Sam   | 23   |
+----+-------+------+
4 rows in set (0.00 sec)

以下是SELECT *和重命名列的查询 –

mysql> select tbl.*,Name AS StudentName from DemoTable tbl;

这将产生以下输出 –

+----+-------+------+-------------+
| Id | Name  | Age  | StudentName |
+----+-------+------+-------------+
| 1  | John  | 21   | John        |
| 2  | Carol | 24   | Carol       |
| 3  | David | 22   | David       |
| 4  | Sam   | 23   | Sam         |
+----+-------+------+-------------+
4 rows in set (0.00 sec)

阅读更多：MySQL 教程