> Is there any control structure statement similar to select case ... ? If yes > how to use it. I have tried to use, case when <expression> then <expression> > end, but not worked well as I want to use other control structures and sql > statements to be executed for each case.
Personally, I don't understand the question.
Perhaps if you provided an example of what you are trying to do with CASE WHEN and why it doesn't work for you.
It _does_ sound like you need to be using something like pl/pgsql.