在线名词解释大全 - 3 - 详细

统计课程表中共有多少门选修课

A
USE Xk GO SELECT COUNT(*) AS '课程表中选修课程门数' FROM Course GO
B
USE Xk GO SELECT SUM(*) AS '课程表中选修课程门数' FROM Course GO
C
USE Xk GO SELECT AVG(*) AS '课程表中选修课程门数' FROM Course GO
D
USE Xk GO SELECT MIN(*) AS '课程表中选修课程门数' FROM Course GO
正确答案:
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