根据教材中的用户表,并完成以下sql查询
-- 1 select * from user where name like "李%"; -- 2 select * from user where city="北京"; -- 3 update user set credit=240 where name="郭玉"; -- 4删除郭玉的英文名 update user set ename=null where ename="Lucy"; select * from user -- 5所有信誉积分减一 update user set credit=credit-1; SELECT * from user -- 6 delete from user -- 7 delete from user where credit<300;