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Query Cross Reference Table

Author

Topic

skes1
Starting Member

4 Posts

Posted - 2010-02-11 : 11:35:27

I was looking for input on querying a cross reference table.
The table has two columns: Candidate_ID and Experience_ID

A candidate can have multiple experiences and the XREF table is structured to align candidate_ID to experience_ID. For example, If a candidate is assigned 3 experience_ID's, then the XREF table would have three rows.

CAN_ID.......... EXP_ID
16................101
16................102
16................103

When I run a query on the XREF table, for example, to show all candidates who have Airport AND Bridge experience I can't get return results where both values were true. The query returns no rows.

SELECT CANDIDATE_XREF.CANDIDATE_ID FROM CANDIDATE_XREF WHERE CANDIDATE_XREF.EXPERIENCE_ID=@DDLA AND CANDIDATE_XREF.EXPERIENCE_ID=@DDLB

@DDLA is value of drop menu 1
@DDLB is value of drop menu 2

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2010-02-11 : 11:38:00

[code]SELECT CANDIDATE_XREF.CANDIDATE_ID FROM CANDIDATE_XREF WHERE CANDIDATE_XREF.EXPERIENCE_ID IN (@DDLA,@DDLB) GROUP BY CANDIDATE_XREF.CANDIDATE_ID HAVING COUNT(DISTINCT CANDIDATE_XREF.EXPERIENCE_ID) =2[/code]

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