求 SQL记要合并 ._Sql Server

求 SQL记录合并 ...
表1
ID NAM N1 N2 N3
001 AAA 80 0 0

表2
ID NAM N1 N2 N3
001 AAA 0 50 0

表3
ID NAM N1 N2 N3
001 AAA 0 0 30

我用union all 合并后
ID NAM N1 N2 N3
001 AAA 80 0 0
001 AAA 0 50 0
001 AAA 0 0 30

我想要的结果是
ID NAM N1 N2 N3
001 AAA 80 50 30 这个应该是合并成一条记录

------解决方案--------------------

SQL code

select ID,NAM,max(N1) N1,max(N2) N2,max(N3) N3from (你union all后的结果) tgroup by t.ID,t.NAM;
------解决方案--------------------
SQL code--> 测试数据：@表1declare @表1 table([ID] varchar(3),[NAM] varchar(3),[N1] int,[N2] int,[N3] int)insert @表1select '001','AAA',80,0,0--> 测试数据：@表2declare @表2 table([ID] varchar(3),[NAM] varchar(3),[N1] int,[N2] int,[N3] int)insert @表2select '001','AAA',0,50,0--> 测试数据：@表3declare @表3 table([ID] varchar(3),[NAM] varchar(3),[N1] int,[N2] int,[N3] int)insert @表3select '001','AAA',0,0,30SELECT     ID,NAM,MAX(N1) N1,MAX(N2) N2,MAX(N3) N3 FROM (    SELECT * FROM @表1 UNION ALL    SELECT * FROM @表2 UNION ALL    SELECT * FROM @表3)T GROUP BY ID,NAM/*ID   NAM  N1          N2          N3---- ---- ----------- ----------- -----------001  AAA  80          50          30*/