将最大值计算列添加到 Where 子句？

Question

I created a Max value calculated column for trw1, trw2, and trw3. However I can not get the calculated column to work in the where clause.

select *, s.knum as SPI_Knum, s.customer_id as Customer_id, s.season as SPI_Season,
   s.inv as Inventory, s.owner_type as Room_type, s.status, s.trw1, s.trw2, s.trw21, 
   b.[ln curr bal] as MTG_Bal,
   (select max(HighTrw)
    from (values (trw1), (trw2), (trw21)) As updatedate(HighTrw)
   ) as High_TRW
where m.knum is null
   and d.knum is null
   and st.customer_id is null
   and b.[ln curr bal] between '15000' and '7500'
   and max(HighTrw) between '625' and '600'  

I am trying to use this to set criteria. so basically I need to show anything that has a value between 15000 and 7500 but also has a TRW between 625 and 600 from the calculated row.

Answer 1

In order to successfully use the where clause, you'll need to use the entire subquery:

select s.id, s.trw1, s.trw2, s.trw3, 
            (select max(HighTrw)
            from (values (trw1), (trw2), (trw3)) As updatedate(HighTrw))
            as High_TRW
from my_table as s
where (select max(HighTrw)
            from (values (trw1), (trw2), (trw3)) As updatedate(HighTrw)) between '600' and '625'