tsql - use of variable causes update to run very slow -


i have following query.

  update t   set    unitssold = sub.unitssold,     dbo.table1 t          join (select s.customerkey,                       s.weekkey,                       s.productkey,                       sum(s.unitssold)          [unitssold],                  dbo.table2 s                 weekkey >= 335                group  s.weekkey,                          s.customerkey,                          s.productkey) sub            on sub.weekkey = t.weekkey               , sub.customerkey = t.customerkey               , sub.productkey = t.productkey

it runs champ. 2 seconds. when try , make dynamic via following.

      declare @startweekkey int          set @startweekkey = 335    update t   set    unitssold = sub.unitssold,     dbo.table1 t          join (select s.customerkey,                       s.weekkey,                       s.productkey,                       sum(s.unitssold)          [unitssold],                  dbo.table2 s                 weekkey >= @startweekkey                group  s.weekkey,                          s.customerkey,                          s.productkey) sub            on sub.weekkey = t.weekkey               , sub.customerkey = t.customerkey               , sub.productkey = t.productkey

all of sudden, it's super slow.

any ideas?

edit: probalby should have mentioned this, contained in stored proc.

added @startweekkey parameter proc , goes running in few seconds.

this question seems have been asked several times before , general answer has statistics.

try:

update statistics table_or_indexed_view_name

to statistics date , see if makes difference.


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