选择使用UNION QUERY

Question

我想在SQL Server中使用以下查询创建一个新表。我无法理解为什么这个查询不起作用。

Query1：Works

SELECT * FROM TABLE1
UNION
SELECT * FROM TABLE2 

Query2：不起作用。 错误：Msg 170, Level 15, State 1, Line 7 Line 7: Incorrect syntax near ')'.

SELECT * INTO [NEW_TABLE]
FROM
(
SELECT * FROM TABLE1
UNION
SELECT * FROM TABLE2
)

谢谢！

Answer 1

您必须在SQL Server中为派生表定义表别名：

SELECT x.* 
  INTO [NEW_TABLE]
  FROM (SELECT * FROM TABLE1
        UNION
        SELECT * FROM TABLE2) x

“x”是此示例中的表别名。

Answer 2

INSERT INTO #Temp1
SELECT val1, val2 
FROM TABLE1
 UNION
SELECT val1, val2
FROM TABLE2

Answer 3

这是SQL Server 2017的一种有效语法：

USE [<yourdb-name>]
GO

SELECT * INTO NEWTABLE 
FROM <table1-name>
UNION ALL
SELECT * FROM <table2-name>

Answer 4

您也可以尝试：

create table new_table as
select * from table1
union
select * from table2

Answer 5

select *
into new_table
from table_A
UNION
Select * 
From table_B

仅当Table_A和Table_B具有相同的模式

时才有效