THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!

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Code Block

language	sql
title	OR algebra
linenumbers	true

(P1) OR (P2) => (P1, P2)
(P1) OR (ALL) => (ALL)
(P1) OR () => (P1)
(P1, P2) OR (P2, P3) => (P1, P2, P3)


(:1) OR (:2) => (:1, :2)
(P1, :1) OR (P2, :2) => (P1, P2, :1, :2)

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TODO

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