更改别名生成的查询

Question

请参阅下面的示例代码：

DECLARE @TEST TABLE (
    NAME VARCHAR(100) 
) 

INSERT into @TEST VALUES ('NAME_1') 
INSERT into @TEST VALUES ('NAME_2') 

SELECT NAME AS '@NAME' 
    FROM @TEST 
    FOR XML PATH ('POSITION'), ROOT ('POSITIONS') 

The result is: 

<POSITIONS> 
    <POSITION NAME="NAME_1" /> 
    <POSITION NAME="NAME_2" /> 
</POSITIONS> 

I would like to condition the query to have something like this: 

<POSITIONS> 
    <POSITION NAME_MAIN="NAME_1" /> 
    <POSITION NAME_BACKUP="NAME_2" /> 
</POSITIONS> 

是否可以调节基于查询的值的XML属性？

when NAME IS NAME_1 THEN NAME_MAIN 
when NAME IS NAME_2 THEN NAME_BACKUP? 

Answer 1

可能这对你有所帮助 -

DECLARE @TEST TABLE (NAME VARCHAR(100)) 

INSERT INTO @TEST 
VALUES ('NAME_1'), ('NAME_2') 

SELECT 
     '@NAME_MAIN' = NULLIF(NAME, 'NAME_2') 
    , '@NAME_BACKUP' = NULLIF(NAME, 'NAME_1') 
FROM @TEST 
FOR XML PATH ('POSITION'), ROOT ('POSITIONS') 

输出：

<POSITIONS> 
    <POSITION NAME_MAIN="NAME_1" /> 
    <POSITION NAME_BACKUP="NAME_2" /> 
</POSITIONS>