問題詳情
23.有SQL语句：SELECT主讲课程，COUNT(*)FROM教师GROUP BY主讲课程该语句执行结果含有记录个数是
(A)、3
(B)、4
(C)、5
(D)、6
(A)、3
(B)、4
(C)、5
(D)、6
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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