将行转换为列

Posted 2023-04-12

【中文标题】将行转换为列

【英文标题】：Convert Rows into Cols

【发布时间】：2019-05-20 15:48:40

【问题描述】：

我有下表调用 fc_summary：

CALMONTH   COMP_CODE    FC10    FC20    FC30
201901     C001         550      45     100
201901     C002         50       450    10
201901     C003         150      250    120
201901     C004         520      410    10
201901     C005         30       40     105

我想从中创建 my_summary 表

CALMONTH   CODE     AMOUNT
201901     FC10     1300
201901     FC20     1195
201901     FC30     345

我尝试使用 PIVOT 来实现这一点，但无法解决

【问题讨论】：

您需要unpivot。 SO上已经回答了很多类似的问题。取消透视数据后，您只需要 sum 和 group by calmonth, code。

【参考方案1】：

你可以使用这个查询

with t(CALMONTH, COMP_CODE, FC10, FC20, FC30) as
(
 select 201901,'C001',550,45,100  from dual union all
 select 201901,'C002',50,450,10   from dual union all
 select 201901,'C003',150,250,120 from dual union all
 select 201901,'C004',520,410,10  from dual union all
 select 201901,'C005',30,40,105   from dual
)
select CALMONTH, FC as CODE, SUM(VALUE) as VALUE
  from t
 unpivot 
 (
  VALUE for FC in (FC10,FC20,FC30)
 )  
 group by CALMONTH, FC
 order by FC;

CALMONTH    CODE    VALUE
201901      FC10    1300
201901      FC20    1195
201901      FC30    345

还原您的数据