在子查询中返回Max记录，并将其带入我的主查询中

Question

I have need to display the MAX rate for each Schedule and Pay Grade from my sub query and add it to my main query. The select statement for my subquery is as follows:

LEFT OUTER JOIN
 (SELECT FV_PRSAGDTL_VW2.SCHEDULE, FV_PRSAGDTL_VW2.PAY_GRADE,  MAX(FV_PRSAGDTL_VW2.PAY_RATE) as MaxRate
 FROM   FV_PRSAGDTL_VW2 FV_PRSAGDTL_VW2
 WHERE  FV_PRSAGDTL_VW2.R_STATUS in (5,2)
 GROUP By FV_PRSAGDTL_VW2.SCHEDULE, FV_PRSAGDTL_VW2.PAY_GRADE) MAXRate
 ON MAXRate.SCHEDULE = HR_EMP_POSITIONS.SCHEDULE
 AND MAXRate.PAY_GRADE = HR_EMP_POSITIONS.PAY_GRADE

The query executes separately as well as when I add this to my main query, But when I try to pull the max rate into my main query, I am using MAXRate.PAY_RATE as "MAX Rate". I get error message "Invalid column name 'PAY_RATE'."

Thought? Thanks.

Answer 1

Did you notice you have aliased it saying MAX(FV_PRSAGDTL_VW2.PAY_RATE) as MaxRate and then trying with a different column name PAY_RATE and thus the error. Change your subquery part to be like below. Also to avoid confusion, don't alias column and inline view with same name. Now you can access the said column saying XXX.MaxRate

LEFT OUTER JOIN
 (SELECT FV_PRSAGDTL_VW2.SCHEDULE, FV_PRSAGDTL_VW2.PAY_GRADE,  MAX(FV_PRSAGDTL_VW2.PAY_RATE) as MaxRate
 FROM   FV_PRSAGDTL_VW2 FV_PRSAGDTL_VW2
 WHERE  FV_PRSAGDTL_VW2.R_STATUS in (5,2)
 GROUP By FV_PRSAGDTL_VW2.SCHEDULE, FV_PRSAGDTL_VW2.PAY_GRADE) XXX
 ON XXX.SCHEDULE = HR_EMP_POSITIONS.SCHEDULE
 AND XXX.PAY_GRADE = HR_EMP_POSITIONS.PAY_GRADE

Answer 2

Use with Ties and row_number function to return a dirived table of just the max Rates

     (SELECT top 1 with ties FV_PRSAGDTL_VW2.SCHEDULE, FV_PRSAGDTL_VW2.PAY_GRADE, FV_PRSAGDTL_VW2.PAY_RATE
       FROM   FV_PRSAGDTL_VW2 FV_PRSAGDTL_VW2
       WHERE  FV_PRSAGDTL_VW2.R_STATUS in (5,2)
       ORDER BY ROW_NUMBER() over (partition by FV_PRSAGDTL_VW2.SCHEDULE,FV_PRSAGDTL_VW2.PAY_GRADE order by  FV_PRSAGDTL_VW2.PAY_RATE desc)) as MaxRate
  ON MAXRate.SCHEDULE = HR_EMP_POSITIONS.SCHEDULE
  AND MAXRate.PAY_GRADE = HR_EMP_POSITIONS.PAY_GRADE

Answer 3

The Join does not have a column Pay_Rate. It has MaxRate. – WEI_DBA 21 mins ago

This was the correct answer. Thanks for that catch!