CentOS7使用yum安装mysql数据库，centos7yum

CentOS7使用yum安装mysql数据库，centos7yum

在新版本的centos7中默认的yum安装mysql，已经备替换为MariaDB，两者的sql命令和相关操作完全贴合，下面是两种安装方法：

centos7:

内核版本：3.10.0-514.26.2.el7.x86_64

安装MariaDB:

yum install mariadb mariadb-server

启动mariadb服务：

systemctl start mariadb

连接数据库：

mysql -uroot -p

首次默认root密码为空，直接回车进入数据库。

使用mysql_secure_installation进行，设置root密码，删除测试数据库，匿名用户等操作。

cent7以下版本yum安装mysql：

yum install mysql mysql-server mysql-devel

启动服务：

service start mysqld

连接数据库：

mysql -uroot -p

首次默认root密码为空，直接回车进入数据库。

使用mysql_secure_installation进行，设置root密码，删除测试数据库，匿名用户等操作。

常见mysql语句说明：

语句	语法
AND / OR	SELECT column_name(s) FROM table_name WHERE condition AND|OR condition
ALTER TABLE (add column)	ALTER TABLE table_name ADD column_name datatype
ALTER TABLE (drop column)	ALTER TABLE table_name DROP COLUMN column_name
AS (alias for column)	SELECT column_name AS column_alias FROM table_name
AS (alias for table)	SELECT column_name FROM table_name AS table_alias
BETWEEN	SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2
CREATE DATABASE	CREATE DATABASE database_name
CREATE INDEX	CREATE INDEX index_name ON table_name (column_name)
CREATE TABLE	CREATE TABLE table_name(column_name1 data_type,column_name2 data_type,.......)
CREATE UNIQUE INDEX	CREATE UNIQUE INDEX index_name ON table_name (column_name)
CREATE VIEW	CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition
DELETE FROM	DELETE FROM table_name (Note: Deletes the entire table!!)orDELETE FROM table_name WHERE condition
DROP DATABASE	DROP DATABASE database_name
DROP INDEX	DROP INDEX table_name.index_name
DROP TABLE	DROP TABLE table_name
GROUP BY	SELECT column_name1,SUM(column_name2) FROM table_name GROUP BY column_name1
HAVING	SELECT column_name1,SUM(column_name2) FROM table_name GROUP BY column_name1 HAVING SUM(column_name2) condition value
IN	SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,..)
INSERT INTO	INSERT INTO table_name VALUES (value1, value2,....)orINSERT INTO table_name (column_name1, column_name2,...) VALUES (value1, value2,....)
LIKE	SELECT column_name(s) FROM table_name WHERE column_name LIKE pattern
ORDER BY	SELECT column_name(s) FROM table_name ORDER BY column_name [ASC|DESC]
SELECT	SELECT column_name(s) FROM table_name
SELECT *	SELECT * FROM table_name
SELECT DISTINCT	SELECT DISTINCT column_name(s) FROM table_name
SELECT INTO(used to create backup copies of tables)	SELECT * INTO new_table_name FROM original_table_nameorSELECT column_name(s) INTO new_table_name FROM original_table_name
TRUNCATE TABLE(deletes only the data inside the table)	TRUNCATE TABLE table_name
UPDATE	UPDATE table_name SET column_name=new_value [, column_name=new_value] WHERE column_name=some_value
WHERE	SELECT column_name(s) FROM table_name WHERE condition