下列（）是SQL语言查询出员工E_mail地址的语句。<br>A:select staffno from staff where E_mail＝NULL<br>B:select staffno from staff where E_mail NULL<br>C:select staffno from staff where E_mail is NULL<br>D:select staffno from staff where E_mail is not NULL

下列（）是SQL语言查询出员工E_mail地址的语句。
A:select staffno from staff where E_mail＝NULL
B:select staffno from staff where E_mail NULL
C:select staffno from staff where E_mail is NULL
D:select staffno from staff where E_mail is not NULL

出自：初级中学教师资格证

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