加入两个查询后缺少值

Question

我有疑问：

select 
       coalesce(t1.L1, t4.L2) as L1, 
       coalesce(t1.L2, t4.L2) as L2, 
       coalesce(t1.S, t4.S) as S,
       coalesce(t1.Q, t4.Q) as Q,
       coalesce(t1.Value, 0) as Value, 
       coalesce(t4.Prev_Value, 0) as Prev_Value
from (
  select L1, L2, S, Q, sum(value) as Value
  from table1
  group by L1, L2, S, Q
  ) as t1
left join
(
  select L1, L2, S, Q, sum(value) as Prev_Value
  from table1
  group by L1, L2, S, Q
) as t4 on
t1.L1 = t4.L1 and
t1.L2 = t4.L2 and
t1.Q = cast((cast(left(t4.Q,4) as numeric) +1) as varchar)+right(t4.Q,2) and
t1.S = t4.S

我现在得到结果：

我知道在 2015 财年第一季度我没有值 C（对于 S1 列）。但是如何显示缺失值呢？

完全外部连接的结果：

Answer 1

使用 FULL OUTER JOIN，但包含一个 WHERE 子句，用于消除 t4 table 中您不想看到的行。

Answer 2

也改

t1.Q = cast((cast(left(t4.Q,4) as numeric) +1) as varchar)+right(t4.Q,2)

到

t1.Q = 'FY'+cast((cast(substring(t4.Q,3,6) as numeric) +1) as varchar)+right(t4.Q,2)

加入两个查询后缺少值

Missing value after join two query

sql-server

sql-server-2008

join

null

jointable