查询成绩为空值的学生的信息，语法命令为（）

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A.select * from sc where grade=null

B.select * from sc where grade is null

C.select * from sc where grade is ‘’

D.select * from sc where grade=’’

正确答案：select * from sc where grade is null

Tag：SqlServer数据库原理与应用语法命令时间：2023-12-26 10:57:42