How to exclude records from the outer query
My apologies if this was requested. I find no answer. I don't know what terminology should be for that matter.
In simple terms, I want to use the custom in where clause to select records. Problem is function will fail if applied to old records, as there was no relevant data. I have logic to exclude old records, but the problem is that this process running function before old records are excluded. I tried an inside view to exclude records before their passage in the outer query, but this does not resolve the situation.
Below shows high level required
Select x
tab
where (condition to exclude the old records)
and function (tab.y) = value
If I rewrite as below, still have the problem. Was hoping to exclude former records apply before function.
Select inn.x
Of
(select x,
There
tab
where (condition to exclude the old records)) inn
where function (inn.y) = value
Thank you
Hello
Including ROWNUM in the result set of the query-void will force the subquery to do first:
Select inn.x
Of
(select x,
There,
ROWNUM AS r
tab
where (condition to exclude the old records)
) inn
where the function (inn.y) = some_value
Since ROWNUM depends on the WHERE clause of the query-sup, the query cannot be rewritten to the main to do first query WHERE clause.
Tags: Database
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