在单个MySQL查询中为所有列名设置“别名”
要为列名设置别名,语法如下:
select yourColumnName1 anyAliasName1,yourColumnName2 anyAliasName2from 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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