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Asked by blacklord in MySQL Server
Hi All,
The database structure is;
tbl_members:
---------------------
MemberID
Name
Email
tbl_memberships:
---------------------
MembershipID
RelMemberID
RelClubID
MembershipDate
Let's say there is member A and he has two memberships in the second table. I want to retrieve the list of members who are member of club A and B. How can I retrieve all members who have memberships to club A and B?
SELECT * FROM tbl_members INNER JOIN tbl_memberships ON tbl_Members.MemberID = tbl_memberships.RelMemberI
D WHERE tbl_memberships.RelClubID=
2 OR tbl_memberships.RelClubID=
3
The above query will cause duplicate rows if a user is a member of both ClubID2 and 3. If I use GROUP BY tbl_members.MemberID, it causes SQL query to hand down if you have 500,000 rows. What can I use alternate to GROUP BY? DISTINCT seems not to be working.
Any suggestions?
20091111-EE-VQP-89 / EE_QW_2_20070628