将 UNPIVOT 从 SQL Server 转换为 Redshift

Question

我有一个来自 SQL Server 的脚本，我需要将其转换为 Redshift

这是脚本的一部分，我遇到了麻烦

    UNPIVOT
(
SeatCharge
FOR Description IN (
        PM_Core,
        PM_RCM,
        PM_Advanced_RCM,
        PM_Payroll,
        PM_DXM,
        PM_Messaging,
        PM_Tasks,
        Clinical_Core,
        Clinical_Data_Collection,
        Clinical_Auditing_Tools,
        Clinical_Group_Sessions,
        Clinical_ABC_Data,
        Clinical_AGA,
        LMS_Core,
        HRIS_PTO,
        LMS_Course_Groups,
        PM_Reach_Me,
        PM_Redshift,
        HRIS_Benefits,
        HRIS_Assets)
)u

如何正确地将其转换为红移？

Answer 1

您可以尝试在 amazon-redshift

中使用union all 来制作UNPIVOT

SELECT  PM_Core SeatCharge
FROM yourTable
union all
SELECT PM_RCM 
FROM yourTable
union all
SELECT PM_Advanced_RCM 
FROM yourTable
union all 
SELECT PM_Payroll 
FROM yourTable
union all 
SELECT PM_DXM 
FROM yourTable
....

注意

当您在做UNPIVOT 时需要确保UNPIVOT 的列数据类型相同。