在SQLServer中,要查询student表中所有email字段非空的email信息,以下语句正确的是()
A.selectemailfromstudentwhereemail!=null
B.selectemailfromstudentwhereemailnotisnull
C.selectemailfromstudentwhereemailnull
D.selectemailfromstudentwhereemailisnotnull
D、selectemailfromstudentwhereemailisnotnull