update with Case Conditions and Joins

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SQL-Server-2005

, +

SQL

update K_RT_PurchaseDet PD inner join K_RT_Productdetails PS on PD.product=PS.sno ) set quantity=

(
case
when ((quantity-@TransferQnty)<=0)
then attrited='true'
else
(quantity-@TransferQnty)
end
)
where PS.productname=@Purchaseid

I am getting an error like "Incorrect syntax near PD"...

Posted 26-Jan-14 19:13pm

Siva Hyderabad

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Roja23 · Accepted Answer · 2014-01-26T19:21:00

You can't have assignment operation inside a case statement, it can only return value which can be assigned to quantity in your above code. So replace attrited = 'true' with whatever value you want to assign to quantity. It will be something like below.

SQL

update PD set quantity =
  (
    case
      when ((quantity - @transferqnty) <= 0) then quantity
      else (quantity - @transeferqnty)
    end
  )
from K_RT_PurchaseDet as PD
inner join K_RT_Productdetails as PS on PD.product = PS.sno
where PS.productname = @Purchaseid

In the above i am maintaning the same value for quantity.