SQL实现根据类型对金额进行归类

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select
temp.id,sum(temp.typyA_amount) as typyA_amount,sum(temp.typyB_amount) as typyB_amount,sum(temp.typyC_amount) as typyC_amount,sum(temp.typyD_amount) as typyD_amount
from 
  (select t.id,sum(t.A) as typyA_amount  --A,null as typyB_amount --B,null as typyC_amount --C,null as typyD_amount --D
  from table t
  where t.type ='A'
  group by t.id
  union all
  select t.id,null as typyA_amount  --A,sum(t.B) as typyB_amount --B,null as typyD_amount --D
  from table t
  where t.type ='B'
  group by t.id
  union all
  select t.id,sum(t.C) as typyC_amount --C,null as typyD_amount --D
  from table t
  where t.type ='C'
  group by t.id
  union all
  select t.id,sum(t.D) as typyD_amount --D
  from table t
  where t.type ='D'
  group by t.id) temp

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