单项选择题
A、WHERE B、GROUP BY C、ORDER BY D、HAVING
A、关系代数 B、关系演算 C、SQL D、ORACLE
A、X>20 AND X<25 B、X≥20 AND X<25 C、X>20 AND X≤25 D、X≥20 AND X≤25
A、GROUP BY B、ORDER BY C、WHERED. D、HAVING
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