>>>>Hi,
>>>>
>>>>Where do you put an OUTPUT command in a SQL Update of the following "structure"?
>>>>
>>>>

>>>>update t1 set @Qty2Use = case when t1.qty_left >= @QtyUseRemain then @QtyUseRemain else t1.qty_left end,  
>>>>t1.qty_left = t1.qty_left - @Qty2Use
>>>>from #InvStockTemp t1 inner join (select top (1) ......
>>>>.....
>>>>

>>>>
>>>>I declared the temp variable as follows:
>>>>

>>>>DECLARE @UpdateOutput table
>>>>(
>>>>  QtyLeftOld int,
>>>>  QtyLeftNew int
>>>>);
>>>>

>>>>
>>>>But when I put the OUTPUT right before FROM #InvStockTemp, I get an error.
>>>>
>>>>Where do I put it?
>>>>
>>>>TIA
>>>
>>>See sample E in this https://docs.microsoft.com/en-us/sql/t-sql/queries/output-clause-transact-sql?view=sql-server-ver15
>>
>>Already have a question about OUTPUT.
>>
>>In the UPDATE I set the new value of the column QTY_LEFT. And then, based on the value in this column, I have to set the value of the column REC_ID. So, my understanding - since the order of evaluation is not certain - to use the New Value of the column QTY_LEFT when setting the value of REC_ID.
>>So, my question, can I SET the value of column REC_ID after I have the OUTPUT command?
>
>It will be a new separate UPDATE command.

Then, if I understand this correctly, I have to do the Select Top(1) twice. That is, the "long" UPDATE command finds the oldest (chronologically) record in the table. Then it update the column QTY_LEFT.
Then, I have to find this record again, in order to use the OUTPUT variable and update the column REC_ID.
Do I understand the sequence correctly?