下面选项中,用于求出表中某个字段所有值的总和的函数是()
A. avg()
B. sum()
C. count()
D. total()
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下面选项中,用于求出某个字段所有值的平均值的函数是()
A. avg()
B. length()
C. count()
D. total()
下面选项,用于排序的关键字是()
A. GROUP BY
B. ORDER BY
C. HAVING
D. WHERE
下面选项,对字段进行排序时,默认采用的排序方式是()
ASC
B. DESC
C. ESC
DSC
向表中name字段添加值为youjun,grade字段值为55,的正确SQL语句是() (多选)
A. INSERT INTO student(name, grade)VALUES('youjun', 55);
B. INSERT INTO student(grade,name)VALUES(55,'youjun');
C. INSERT INTO student(‘grade’,’name’)VALUES(55,'youjun');
D. INSERT INTO student(grade,’name’)VALUES(55,”youjun”);