Update and checking at the same time

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I have table as follows

CatID| Total_Amount | Amount_paying |IsCompleted
-----|--------------|---------------|------------
CA01 | 2000 | 1700 | 0

In this table I have to check if Total_Amount and amount_paying is same or not?
Where total_amount is fixed and amount_paying will get maximize after each insert statement.

So If I insert a record
CatID| Total_Amount | Amount_paying |IsCompleted
-----|-------------- |------------ |------------
CA01 | 2000 | 1700 | 0
CA01 | 2000 | 300 | 1
Here I am paying 300 , so Total_Amount = Amount_Paying and IsCompleted=1

SQL

UPDATE tbl
    		SET is_completed = CASE WHEN SUM(amount_paying) = Total_Amount THEN 1 ELSE 0 END
            WHERE tbl.branch_id =@branchid AND CatID=@catid

giving `An aggregate may not appear in the set list of an UPDATE statement.`

What I have tried:

UPDATE tbl
SET is_completed = CASE WHEN SUM(amount_paying) = Total_Amount THEN 1 ELSE 0 END
WHERE tbl.branch_id =@branchid AND CatID=@catid

Posted 25-Nov-17 1:42am

babaiZhere

Updated 25-Nov-17 4:40am

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Peter Leow · Answer 1 · 2017-11-25T04:40:00

Just one look at your table reveals some fundamental problems with your database design:
1. The `Total_Amount` field has duplicate values, e.g. 2000. If this field is dependent on CatID only, shouldn't they be in a separate table, say `tbl2`?
2. How do you know which `Is_Completed` row to insert `1` when `Total_Amount` = `Amount_Paying`? May be it should be moved to that separate table `tbl2` too.
3. The two tables `tbl` and `tbl2` can then link through CatID field.
Check this out Introduction to database design[^]