Need help for sql query join

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Hi all

SQL

SELECT FK_PROJECT_ID FROM PROJECT_LEAD_MAPPING PLM WHERE PLM.LEADER_ID = 1 AND PLM.IS_ACTIVE = 1
UNION
SELECT FK_PROJECT_ID FROM TESTCAT_PROJECT_MAPPING TPM WHERE TPM.FK_TESTCAT_ID = 1 AND TPM.IS_ACTIVE = 1
UNION
SELECT PROJECT_ID FROM PROJECT_MEMBER PM 
WHERE (PM.START_DATE <= '2012-4-17' AND PM.END_DATE > '2012-4-17') AND PM.MEMBER_ID = 1

How to write the above query using join.

Thanks in advance

Posted 17-Apr-12 20:25pm

bhagirathimfs

Updated 17-Apr-12 20:26pm

v2

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*Karthik Harve* · Accepted Answer · 2012-04-17T20:56:00

Hi,
From the query that you have given, I guess that you can use columns "LEADER_ID, FK_TESTCAT_ID , MEMBER_ID" for the joining conditions, because you are comparing all these column values to "1". So, by guesing this I am giving you this below query which uses inner Join. Try it out.

SQL

SELECT FROM PLM.FK_PROJECT_ID, TPM.FK_PROJECT_ID,PM.PROJECT_ID FROM   PROJECT_LEAD_MAPPING PLM 
INNER JOIN 
TESTCAT_PROJECT_MAPPING TPM ON PLM.LEADER_ID = TPM.FK_TESTCAT_ID 
INNER JOIN
PROJECT_MEMBER PM ON PM.MEMBER_ID = PLM.LEADER_ID
WHERE PLM.IS_ACTIVE = 1 AND TPM.IS_ACTIVE = 1 AND (PM.START_DATE <= '2012-4-17' AND PM.END_DATE > '2012-4-17')

This will give you values in column wise.

hope it helps.