添加表數據

1 insert into car values(‘ ‘,‘ ‘,‘ ‘, ‘ ‘,‘ ‘);

2 insert into car(字段1，字段2，....) values(值1，值2，.....);

3 insert into car set 字段1=值一，字段2=值2，...；

修改表數據

update car set 字段1= 值 where 字段2=值

刪除表數據

delete from 表名 where 字段1 = 值

================簡單查詢===============

1最簡單查詢

select * from car;

2查詢指定列

select name，oil，powers from car；

3 對查出的列名修改名字

select name as ‘ 車名’，oil as ‘油耗’，powers as ‘動力’ from car;

4 按條件查詢

select name ，oil，powers from car where oil = 8.7；

5 多條件查詢

select name， oil， powers from car where oil=8.7 or powers =160；

select name，oil， powers from car where oil = 8.7 and powers =160；

6 範圍查詢

select * from car where price>=40and price<=60;

select * from car where price between 40 and 60；

7離散查詢

select * from car where powers = 130 or powers=150 or powers=170；

select *from car where powers in （130，150，170）；

select * from car where powers not in (130,150,170）；

8模糊查詢

select *from car where name like ‘ %寶馬%’；

select * from car where name like “_寶馬%"; _代表一個字符

9 排序查詢 asc 升序 desc 降序 order 排隊

select * from car order by oil asc;

select * from car order by brand asc,price desc;

10去重復查詢 distinct

select distinct brand from car；

11分頁查詢

select* from car limit 10，5；

n:m=5

limit (n-1)*m,m;

12 聚合函數查詢

count(列名）sum(列名) avg(列名) max(列名) min(列名)

select count(*) from car;

select sum(price) from car;

select avg(price) from car;

select max(price) from car;

select min(price) from car;

6.3 數據庫增刪改查