从student表删除年龄大于30的记录的正确SQL命令是

A．DELETE FOR年龄>30

B．DELETE FROM student WHERE年龄>30

C．DELETE student FOR年龄>30

D．DELETE student WHERE年龄>30

[单选题]从student表删除年龄大于30的记录的正确SQL命令是（　　）。A.DELETEFOR年龄>30B.DELETEFROMstudentWHERE年

[单选题]从student表删除年龄大于30的记录的正确SQL命令是（ ）。A． DELETE FOR年龄>30B． DELETE FROM student WHERE年龄>30C． DELETE student FOR年龄>30D． DELETE student WHERE年龄>30

[单选题]从student表删除年龄大于30的记录的正确SQL命令是（ ）。A． DELETE FOR年龄>30B． DELETE FROM student WHERE年龄>30C． DELETE student FOR年龄>30D． DELETE student WHERE年龄>30

[单选题]使用SQL语句将学生表S中年龄(AGE)大于30岁的记录删除，正确的命令是______。A．DELETE FOR AGE＞30B．DELETE FROM S WHERE AGE＞30C．DELETE S FOR AGE＞30D．DELETE S WHERE AGE＞30

[单选题]使用SQL语句将学生表S中年龄(AGE)大于30岁的记录删除，正确的命令是A．DELETE FOR AGE＞30B．DELETE FROM S WHERE AGE＞30C．DELETE S FOR AGE＞30D．DELETE S WHERE AGE＞30

[单选题]使用SQL语句将学生表S中年龄（AGE）大于30岁的记录删除，正确的命令是（ ）。A．DELETE FOR AGE>30B．DELETE FROM S WHERE AGE>30C．DELETE S FOR AGE>30D．DELETE S WHERE AGE>30

[单选题]使用SQL语句将学生表S中年龄(AGE)大于30岁的记录删除,正确的命令是A．DELETE FOR AGE>30B．DELETE FROM S WHERE AGE>30C．DELETE S FOR AGE>30D．DELETE S WHERE AGE>30

[单选题]使用SQL语句将学生表S中年龄(AGE）大于30岁的记录删除，正确的命令是A）DELETE FOR AGE>30 B）DELETE FROM S WHERE AGE>30C）DELETE S FOR AGE>30 D）DELETE S WHERE AGE>30

[单选题]删除student表的“平均成绩”字段的正确SQL命令是A．DELETE TABLE student DELETE COLUMN平均成绩B．ALTER TABLE student DELETE C0LUMN平均成绩C．ALTER TABLE student DROP COLUMN平均成绩D．DELETE TABLE student DROP COLUMN平均成绩

[单选题]删除student表的“平均成绩”字段的正确SQL命令是（　　）。A.DELETETABLEstudentDELETECOLUMN平均成绩B.ALTE