MS Access Query's Answer is Conflict why.....

Question

0.00/5 (No votes)

See more:

Hello,

I write one query in Ms access as follow

SQL

SELECT * from EmployeePaymentDetails where EmpId =@EmpID and PayID= ( select MAX(PayId) from  EmployeePaymentDetails where PayDate = ( select Max(PayDate) from EmployeePaymentDetails where EmpID=@EmpID) ) and PayDate = ( select Max(PayDate) from EmployeePaymentDetails where EmpID=@EmpID)

my table has 4 records as follows

EmployeePaymentDetails
PayID PayDate	      EmpID	AmountPaid	RemainingAmt
1   	19/05/2010	1	0	         5000
1   	19/06/2010	1	0	         10000
2   	19/05/2010	2	0	         5000
2   	19/06/2010	2	0	         10000

if I pass EmpId = 2 it give me correct anwser as RemainingAmt = 10000 but if I pass EmpId = 1 dr doesn't contains any thing why?

it should give me answer as RemainingAmt= 10000

Posted 18-Apr-10 21:53pm

archana_Kalyankar

Updated 18-Apr-10 22:05pm

Tom Deketelaere

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dylan Morley · Answer 1 · 2010-04-18T22:41:00

This statement is returning 2 as the value.

(select MAX(PayId) from  EmployeePaymentDetails where PayDate = ( select Max(PayDate) from EmployeePaymentDetails where EmpID=@EmpID) )

That's evaluating as SELECT MAX(PayId) WHERE PayDate = '19/06/2010'. So your statement overall is evaluating as

SELECT * from EmployeePaymentDetails where EmpId = 1 and PayID = 2

...which of course returns no records.

Since PayID isn't unique, this logic doesn't really offer you anything. How about the below..?

SQL

SELECT 
    *
FROM 
    EmployeePaymentDetails
WHERE 
    (((EmployeePaymentDetails.EmpID)=[@EmpID]) 
AND 
    ((EmployeePaymentDetails.PayDate) =
(
    select Max(PayDate) from EmployeePaymentDetails where EmpID=@EmpID))
);