ACCESS FEED: RE: [MS_AccessPros] Query Does Not Return Any Results

Selasa, 05 November 2013

RE: [MS_AccessPros] Query Does Not Return Any Results

John,

You are correct table A has all the current certifications an employee has and table B list all the potential certifications. I never even thought of using a Cartesian product. I'll try this and let you know how it works.

Thanks!

Bill Beshlian

From: MS_Access_Professionals@yahoogroups.com [mailto:MS_Access_Professionals@yahoogroups.com] On Behalf Of John Viescas
Sent: Tuesday, November 05, 2013 2:12 PM
To: MS_Access_Professionals@yahoogroups.com
Subject: RE: [MS_AccessPros] Query Does Not Return Any Results

Bill-

Does "A" return all the certifications that an employee does have and "B" return *all* potential certifications? What you then need is the Cartesian product of both sets, then select the rows where the certification part isn't in the set related to the current employee.

SELECT A.Employee, A.Name, B.[Job Code], B.[Lic Cert Code], B.GroupNum
FROM REQ_LIC_W_GRP_NUM_QRY AS A, REQ_LIC_JOBCODE_QRY AS B
WHERE NOT Exists (SELECT C.GroupNum
FROM REC_LIC_JOBCODE_QRY As C
WHERE C.GroupNum = B.GroupNum AND
C.[Job Code] = B.[Job Code] AND C.[Lic Cert Code] = B.[Lic Cert Code])

That's pretty sloppy, but I think it will work. Essentially, you are matching all employee records with all certifications, then selecting the certifications that do not show up in a current employee record.

John Viescas, Author
Microsoft Access 2010 Inside Out
Microsoft Access 2007 Inside Out
Microsoft Access 2003 Inside Out
Building Microsoft Access Applications
SQL Queries for Mere Mortals
http://www.viescas.com/
(Paris, France)

From: MS_Access_Professionals@yahoogroups.com [mailto:MS_Access_Professionals@yahoogroups.com] On Behalf Of Beshlian,Bill
Sent: Tuesday, November 05, 2013 5:42 PM
To: MS_Access_Professionals@yahoogroups.com
Subject: [MS_AccessPros] Query Does Not Return Any Results

Hello,

Here is the SQL Code for my query:

SELECT A.Employee, A.Name, A.[Job Code], A.[Lic Cert Code], A.GroupNum
FROM REQ_LIC_W_GRP_NUM_QRY AS A LEFT JOIN REQ_LIC_JOBCODE_QRY AS B ON (A.GroupNum = B.GroupNum) AND (A.[Lic Cert Code] = B.[LicCert]) AND (A.[Job Code] = B.JobCode)
WHERE (((A.[Job Code])="000496") AND ((Exists (Select B.GroupNum
From REQ_LIC_JOBCODE_QRY AS B, REQ_LIC_W_GRP_NUM_QRY AS A
Where B.GroupNum=A.GroupNum ))=False));

Currently it returns nothing. What I'd like it to return is:

Employee

Name

Job Code

Lic Cert Code

GroupNum

00000

Smith, Joseph E

000496

ABMS-BC

1

00000

Smith, Joseph E

000496

DEA-NE

5

If I change the condition to True in the Exists statement/subquery it returns the certifications Dr. Smith already possesses. I am looking for the two he does not (shown in table above). Is there something missing in the logic for the query or subquery?

Thank you,

Bill Beshlian

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