Upper Bound in FOR loop does not get altered in loop,Why?

This behavior is as specified in the documentation: FOR-LOOP The range is evaluated when the FOR loop is first entered and is never re-evaluated (Oracle Documentation).

This behavior is as specified in the documentation: FOR-LOOP ... The range is evaluated when the FOR loop is first entered and is never re-evaluated. (Oracle Documentation).

Generally, FOR loops would be fixed iterations For indeterminate looping, use WHILE This isn't Oracle specific, and why there are separate looping constructs.

While it is generally considered a bad idea to change the loop variable's value, sometimes it seems like the only way to go. However, you might find that loops are optimized, and that might be what is happening here.

There's nothing preventing the language designers from saying "The upper bound of the for loop is evaluated only once". This appears to be the rule that plsql is following here.

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