交叉引用表列

Question

I am trying to select the names from one table column and then ignore if any rows have the same member as the user id in a different column.

for example i would like to select all the "groupNames" from groups then check the "members" column for any members that match the user.

members    groupName
mike       test
andy       test
eric       runners
erica      test

If the user was "mike", I would like the list to ignore any row that had the "groupName" test as "mike" also has that as a group name and the list should only display runners.

Is this possible? I have tried to research it but not even sure what I need to search for?

Answer 1

Does this do what you want?

select t.*
from groups t
where t.groupName <> (select t2.groupName from groups t2 where t2.members = 'Mike');