添加数据
INSERT students (id,class_id,name,gender,score) VALUES (14,2,"赵强","男",79)
修改数据
UPDATE students SET NAME="威威" WHERE id=14
不加where时所有的name都会被修改
删除数据
DELETE FROM students WHERE id >10 and id <14
或
DELETE FROM students WHERE id BETWEEN 10 AND 14 注:10 =< id =<14