sql-server - 如何在 T-SQL 中合并 XML？

Question

似乎无论多读文档都对我没有帮助。考虑简化示例:

declare @table1 table ( id int, parent xml )
insert @table1 values( 1, '<Root></Root>' )
declare @table2 table ( id int, guts xml )
insert @table2 values( 1, '<Guts>hi mom!</Guts>' )

select t1.parent.query('')
from @table1 t1 inner join @table2 t2 on t1.id = t2.id

将什么传递给查询函数以生成此结果？

<Root><Guts>hi mom!</Guts></Root>

Answer 1

以下内容不是基于集合的，但也许会有所帮助(仅限 SQL2008)

declare @table1 table ( id int, parent xml )
insert @table1 values( 1, '<Root></Root>' )
declare @table2 table ( id int, guts xml )
insert @table2 values( 1, '<Guts>hi mom!</Guts>' )

DECLARE @id int;
DECLARE @results table (id int, results xml);

DECLARE idCursor CURSOR FOR 
    select id from @table1
OPEN idCursor

FETCH NEXT FROM idCursor INTO @id

WHILE @@FETCH_STATUS = 0
BEGIN
    DECLARE @parent xml, @guts xml

    SELECT @parent = parent FROM @table1 where id = 1;
    SELECT @guts = guts FROM @table2 where id = 1;
    SET @parent.modify('insert sql:variable("@guts") into (/Root[1])');

    INSERT @results (id, results) values (@id, @parent);

    FETCH NEXT FROM idCursor INTO @id

END 

CLOSE idCursor
DEALLOCATE idCursor

select * from @results;