TSQL列到行

我有以下表格列（带有示例数据）

每个GM栏是针对每个月的

最后我想要这样的东西

[MemberID] - [GMP] - [GMS] - [MonthNumbr]
165 - 30 - 70 - 1
165 - 50 - 60 - 2
189 - 50 - 40 - 1
...
165 - 40 - 70 - 12
189 - 50 - 40 - 12

其中，GMP是当月类别产品的总经理，GMS是当月服务的总经理

我尝试过取消PIVOT和交叉申请，但我认为这已经超出了我的经验，并且一直被卡住

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提前谢谢

为此，我喜欢使用

外部应用

。然后，聚合有助于：

select v.member_id, v.monthnumber,
       max(case when category = 'products' then gm end) as gmp,
       max(case when category = 'service' then gm end) as gms
from t outer apply
     (values (t.member_id, 1, t.gm1, t.category),
             (t.member_id, 2, t.gm2, t.category),
              . . .
     ) v(member_id, monthnumber, gm, category)
group by v.member_id, v.monthnumber;

编辑：

在子查询中进行聚合可能更有效：

select v.*
from t outer apply
     (select v.member_id, v.monthnumber,
             max(case when category = 'products' then gm end) as gmp,
             max(case when category = 'service' then gm end) as gms
      from (values (t.member_id, 1, t.gm1, t.category),
                   (t.member_id, 2, t.gm2, t.category),
                   . . .
           ) v(member_id, monthnumber, gm, category)
     ) v;

（由于聚合算法的性质，一组小聚合应该比一个大聚合更有效。）

select v.*
from t outer apply
     (select v.member_id, v.monthnumber,
             max(case when category = 'products' then gm end) as gmp,
             max(case when category = 'service' then gm end) as gms
      from (values (t.member_id, 1, t.gm1, t.category),
                   (t.member_id, 2, t.gm2, t.category),
                   . . .
           ) v(member_id, monthnumber, gm, category)
     ) v;