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在单个MySQL查询中为所有列名设置“别名”

2024-05-19 16:24:06 450

要为列名设置别名，语法如下：

select yourColumnName1 anyAliasName1,yourColumnName2 anyAliasName2
   from yourTableName anyAliasName;

要了解上述语法，让我们创建一个表-

create table DemoTable2014
   -> (
   -> FirstName varchar(20),
   -> LastName varchar(20)
   -> );

使用插入命令在表中插入一些记录-

insert into DemoTable2014 values('John','Smith');

insert into DemoTable2014 values('David','Miller');

insert into DemoTable2014 values('John','Doe');

insert into DemoTable2014 values('Chris','Brown');

使用select语句显示表中的所有记录-

select *from DemoTable2014;

这将产生以下输出-

+-----------+----------+
| FirstName | LastName |
+-----------+----------+
| John      | Smith    |
| David     | Miller   |
| John      | Doe      |
| Chris     | Brown    |
+-----------+----------+
4 rows in set (0.00 sec)

这是在单个MySQL查询中为列名设置“别名”的查询-

select FirstName StudentFirstName,LastName StudentLastName
   -> from DemoTable2014 tbl;

这将产生以下输出-

+------------------+-----------------+
| StudentFirstName | StudentLastName |
+------------------+-----------------+
| John             | Smith           |
| David            | Miller          |
| John             | Doe             |
| Chris            | Brown           |
+------------------+-----------------+
4 rows in set (0.00 sec)

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在单个MySQL查询中为所有列名设置“别名”

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