SQL Server--Is it possible to work around using a temporary table for a query that filters based on an alias case column? -


i trying alter base query selects data several joined tables, , filters out rows based on case when below. result set returned follows:

  • if of rows return 0 in case column, return 1 line '0' in overdue column (the "return 1 line" portion taken care of distinct.)

  • if of rows return 1 case column, return 1 line '1' in overdue column.

the base follows:

select distinct t1.*, case when t3.mtemp > t3.mtemplimit     1         when t3.tothours > t3.thourslimit             1             else 0 end  [overdue]   table_1 t1 left join table_2 t2 on t1.resno = t2.resno , t1.pcode = t2.pcode  left join table_3 t3 on t2.repjobno = t3.repjobno left join table_4 t4 on t4.typeid = t2.reptype     t2.repstat = 1

the catch is, i've created working version of using temp table , doing if exists/else query on temp table's overdue column. however, i've been informed solution may not useable (due having go through front-end software).

is possible workaround not involve using temporary table? i've been making attempts @ using both derived table , ctes, neither of have yielded usable, due fact 1 cannot use if/else clauses after (which counting on).

i'm still getting hang of t-sql, appreciated.

sounds simple row_number() , couple of ctes work:

;with rs1 (   select t1.*,   case when t3.mtemp > t3.mtemplimit     1         when t3.tothours > t3.thourslimit             1             else 0   end  [overdue]   table_1 t1   left join table_2 t2 on t1.resno = t2.resno , t1.pcode = t2.pcode    left join table_3 t3 on t2.repjobno = t3.repjobno   left join table_4 t4 on t4.typeid = t2.reptype       t2.repstat = 1  ), rs2 (      select *,row_number() on (order overdue desc) rn      rs1  )  select * rs2 rn = 1

(there's no need distinct we're returning 1 row)


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