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Help with Minus query as a view
Posted by: Jeremy Wickham
Date: December 01, 2010 10:04AM

I am migrating some data from oracle to mysql. I have created the same data structure and I have migrated the data into the tables. So my dilemma is this. We have a view that pulls the data out of the tables based on what groups they belong and if those groups are to be included/excluded from other groups.

group_members is the groups users belong to
matrix_group defines if a group should be included or excluded from another group.

create or replace view member_belongs_to_group_view (username, groupid) as
select username, c.groupid
from group_members a, matrix_group c
where a.gid in
(select member_groupid from matrix_group where groupid = c.groupid and state = 'I')
select username, d.groupid
from group_members b, matrix_group d
where b.gid in
(select member_groupid from matrix_group where groupid = d.groupid and state = 'E')

I have been able to create 3 different views to get this to properly execute, but it takes it way to long to return any data. This query executed in oracle takes less than a second.

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Help with Minus query as a view
December 01, 2010 10:04AM

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