制订保险规划的原则包括以下哪些内容？()

根据SQL标准，删除一个表中的记录，下面哪个语句适用？()

A DROP TABLE

B DROP

C DELETE

D ERASE

根据SQL标准，要修改表student中所有学生的年龄age，使之在原值基础上减一，下面哪个语句适用？()

A update student set age = 1

B update student set age = age - 1

C update age = age -1 from student

D update from student where age = age -1

A．UPDATE

B．INSERT

C．ALTER

D．MODIFY

根据SQL标准，删除一个表，应该使用下面哪个语句？()

A DELETE TABLE

B DROP TABLE

C DELETE VIEW

D DROP DATABASE

根据SQL标准，创建一个表，应该使用下面哪个语句？()

A CREATE TABLE

B CREATE INDEX

C CREATE VIEW

D CREATE DATABASE

根据SQL标准，要创建唯一索引该使用下面哪种语句？()

A CREATE UNIQUE INDEX

B CREATE CLUSTER INDEX

C CREATE ONLY INDEX

D CREATE PRIMARY INDEX

根据SQL标准，要查询表student中所有年龄age小于所有学生的平均年龄的记录，下面哪条语句适用？()

A select * from student where age< avg(age)

B select * from student having age< avg(age)

C select * from student a where a.age< (select avg(b.age) from student b)

D select * from student a where (select avg(b.age) from student b ) >= a.age

A delete from student

B delete all from student

C delete * from student

D drop table student

SQL中修改数据的语句UPDATE，可以修改基本表的结构。()