集合演算子の評価順序
Filed in Oracle Master on 8月.08, 2009
集合演算子には、UNION、UNION ALL、MINUS、INTERSECTがあるが、優先順位はない。基本的には集合演算子は左から右に評価される。ただし、SQL文を見易くし、また将来的なSQLの仕様変更に対応するために、カッコを使って明示的に優先順位を指定しておいた方が良い。
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