Why LIMIT and OFFSET are commutative

["Andrus" <kobruleht2@xxxxxx>]

I found that

SELECT * FROM foo
ORDER BY bar
OFFSET n
LIMIT m

and

SELECT * FROM foo
ORDER BY bar
LIMIT m
OFFSET n

produce always same results.

Why ?
OFFSET and LIMIT operations are NOT commutative in general.

Andrus. 



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