uc8

有关系SC(S_ID,C_ID,AGE,SCORE),査找年龄大于22岁的学生的学号和分数,正确的关系代数表达式是( )。

  • Ai和ii
  • B只有ii正确
  • C只有i正确
  • Di和iii正确
参考答案: D
解题思路: >>>立即刷题
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