- 增
- 增加一张表
CREATE TABLE `table_name`(
...
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
- 增加记录
INSERT INTO `your_table_name`(`column_name`)
VALUES
('your_value_one'),
('your_value_two');
- 增加字段
ALTER TABLE `your_table_name`
ADD `your_column_name` ...
AFTER `column_name`;
-
增加索引
- 主键
ALTER TABLE `your_table_name` ADD PRIMARY KEY your_index_name(your_column_name);- 唯一索引
ALTER TABLE `your_table_name` ADD UNIQUE your_index_name(your_column_name);- 普通索引
ALTER TABLE `your_table_name` ADD INDEX your_index_name(your_column_name);- 全文索引
ALTER TABLE `your_table_name` ADD FULLTEXT your_index_name(your_column_name);
- 删
- 逐行删除
DELETE FORM `table_name`
WHERE ...;
- 清空整张表
TRUNCATE TABLE `your_table_name`;
- 删除表
DROP TABLE `your_table_name`;
- 删除字段
ALTER TABLE `your_table_name`
DROP `column_name`;
- 删除索引
ALTER TABLE `your_table_name`
DROP INDEX your_index_name(your_column_name);
- 改
- 变更数据
UPDATE `table_name`
SET column_name=your_value
WHERE ...;
- 变更字段
ALTER TABLE `your_table_name`
CHANGE `your_column_name` `your_column_name` ...(变更);
- 变更字段值为另一张表的某个值
UPDATE `your_table_name`
AS a
JOIN `your_anther_table_name`
AS b
SET a.column = b.anther_column
WHERE a.id = b.a_id...;
- 查
- 普通查询
SELECT `column_name_one`, `column_name_two`
FROM `table_name`;
- 关联查询
SELECT *
FROM `your_table_name`
AS a
JOIN `your_anther_table_name`
AS b
WHERE a.column_name = b.column_name...;
- 合计函数条件查询：WHERE 关键字无法与合计函数一起使用
SELECT aggregate_function(column_name)
FROM your_table_name
GROUP BY column_name
HAVING aggregate_function(column_name)...;
- 同一个实例下跨库查询
SELECT *
FROM database_name.your_table_name
AS a
JOIN another_database_name.your_another_table_name
AS b
WHERE a.column_name = b.column_name...;
- 复制一张表结构
CREATE TABLE `your_table_name`
LIKE `destination_table_name`;
- 完全复制一张表：表结构 + 全部数据
CREATE TABLE `your_table_name`
LIKE `destination_table_name`;
INSERT INTO `your_table_name`
SELECT *
FROM `destination_table_name`;
附录：mysql 常用命令
登陆： mysql -h host -u username -p
列出数据库：SHOW DATABESES;
列出表: SHOW TABLES;
列出表结构: DESC table_name
使用一个数据库：USE database_name;
导入：source 'file';
导出：mysqldump -h 127.0.0.1 -u root -p "database_name" "table_name" --where="condition" > file_name.sql;
查看慢日志：mysqldumpslow -s [c: 按记录次数排序 / t: 时间 / l: 锁定时间 / r: 返回的记录数] -t [n: 前 n 条数据] -g "正则" /path
-
新增用户： insert into
user(Host,User,authentication_string) value('localhost', 'username', password('pwd'))
mysql 5.7 新增用户
// 插入新用户
insert into mysql.user(Host, User, authentication_string, ssl_cipher, x509_issuer, x509_subject
value('localhost', 'username', password('password'), '', '', '');
// 数据库授权
grant all privileges on dbname.name.* to username@localhost identified by 'password';
// 刷新权限信息
FLUSH PRIVILEGES;
原文：https://github.com/TIGERB/easy-tips/blob/master/mysql/sql.md