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Basic Predicate

►►─ expression ─┬─ = ──┬─┬─ expression ──┬────────────────────────────────────►◄
                ├─ < ──┤ └─ (subselect) ─┘
                ├─ > ──┤
                ├─ <> ─┤
                ├─ <= ─┤
                ├─ >= ─┤
                ├─ ¬= ─┤
                ├─ ¬< ─┤
                └─ ¬> ─┘

The following are CA Datacom/DB extensions: