mysql常用语句

Posted 2022-04-28 minister

数据库

增加：
INSERT INTO table_name(key,key1,key2) VALUES(value,value1,value2)

删除：
DELETE FROM table_name WHERE condition;

修改：
UPDATE table_name SET field1=newvalue, field2=newvalue WHERE runoob_id=3;

查询：
SELECT * FROM table_name WHERE 参数
示例：SELECT * FROM table_name WHERE username=‘zhangsan‘ AND pwd=‘12‘


**高级用法**
联合查询：
SELECT b.*, u.username FROM borrowmoney b JOIN user u ON b.userid=u.id
分页查询：
SELECT * FROM table_name LIMIT 5,10; // 检索指定记录，从索引5开始，找到10条数据
获取数据条数：
SELECT COUNT(*) FROM table_name
模糊查询
WHERE category=4 AND name LIKE ‘%白%‘

 

-- DELETE FROM user WHERE id=21
-- 1页 3条数据 0, 3 page row
-- 2页 3条数据 3, 3
-- 3页 3条数据 6, 3
SELECT * FROM user LIMIT (page - 1) * row, row