加入＆＃34;不等于＆＃34;的SUM值线

Question

我需要加入两个表，如下所示：

简单地说，我需要找到Table2中行的SUM值，其中POLE值不等于Table1中的值。什么样的查询可以起作用？

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Answer 1

select t1.Pole, t1.Org, t1.Item, t1.OH, t1.[MAX],
(select sum(OH) from table2 t2 where t2.Pole <> t1.Pole) as [OH in other poles],
(select sum([MAX]) from table2 t2 where t2.Pole <> t1.Pole) as [MAX in other poles]
from table1 t1;

Answer 2

select *
from table1 t
    cross apply (
        select sum(t2.oh) as oh_oth, sum(t2."max") as max_oth
        from table2 t2
        where t2.pole <> t.pole
    ) oth

Answer 3

Cetin's answer会返回您预期的答案集，但将两个标量子查询合并为一个可能更有效：

WITH cte AS 
 ( -- calculate both MAX & SUM using a Cross Join
   SELECT t1.pole
      ,Sum(t2.oh) AS otherSum
      ,Max(t2.[Max]) AS otherMax
   FROM table2 AS t2 CROSS JOIN table2 AS t1
   WHERE t2.Pole <> t1.Pole
   GROUP BY t1.pole
 )
SELECT t1.*, cte.otherSum, cte.otherMax
FROM table1 AS t1
LEFT JOIN cte -- can be an Inner Join if all POLEs exist in both tables 
  ON t1.pole = cte.pole