Thank you for catching this one. I was getting "wrong" results and didn't know why.
>It should be '='
>
>select * from ChildTable where not exists (select 1 from ParentTable where ChildTable.fielda = ParentTable.fielda)
>
>
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
