Need help in update query in SQL server

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I have two tables one is

Student_balance

and second is

MonthlyFeeGenrate

i want to update balance of that student in

student_balance

which Student record is not available in

MonthlyFeeGenrate

E.g

Student_balance

id Student_name Ballance
1 abc 0
2 DEF 0
3 GHI 0

MonthlyFeeGenrate

id Student_name Ballance
1 abc 0
2 DEF 0

How Can i use Except in Update Query

What I have tried:

SQL

UPDATE Student_balance SET Student_balance.Balance = t1.Balance+t2.FinalFee FROM dbo.Student_balance AS t1 INNER JOIN MonthlyFeeGenrate AS t2 ON t1.registration_id = t2.registration_id  WHERE NOT  EXISTS (select t1.registration_id   except select t2.registration_id  where t2.Fee_Month='april')

Posted 10-Jun-19 9:21am

Naqash Younis

Updated 10-Jun-19 22:27pm

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Gerry Schmitz · Answer 1 · 2019-06-10T09:54:00

Solution 1

What's "april" got to do with it? You process the transactions you have; if it's "missing", it's "zero" ?!

Posted 10-Jun-19 9:54am

Gerry Schmitz

CHill60 · Answer 2 · 2019-06-10T22:27:00

I doubt that you actually want to use EXCEPT[^] - see the documentation.

Why do I doubt it? Because in your example SQL you are attempting to use values from MonthlyFeeGenrate to update student_balance but your criteria is that the student is not in MonthlyFeeGenrate - so you cannot retrieve those values.

You have used an inner join so the records that don't exist in BOTH tables won't be presented for the update. Have a look at this article about joins Visual Representation of SQL Joins[^]

So, you can get rid of the EXCEPT and get rid of the NOT EXISTS. I'm guessing you still only want to do this for April so leave that bit in. The correct way to do an Update on a join like that is to use the table alias so your query becomes

SQL

UPDATE t1 SET Balance = t2.Balance+t2.FinalFee 
FROM dbo.Student_balance AS t1 
INNER JOIN MonthlyFeeGenrate AS t2 ON t1.registration_id = t2.registration_id  
WHERE t2.Fee_Month='april'