MYSQL常用命令 MyISAM to InnoDB, max connections , GRANT ALL PRIVILEGES , mysqldump 等等

Date_add

SELECT OrderId,DATE_ADD(OrderDate,INTERVAL 2 DAY) AS OrderPayDate
FROM Orders

MyISAM to InnoDB

ALTER TABLE  boblog_blogs     ENGINE=InnoDB;
ALTER TABLE  boblog_calendar  ENGINE=InnoDB;

max connections

show global variables like "%max_con%";

set global max_connections xxx;

GRANT ALL PRIVILEGES

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'sa123' WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;

flush privileges;

 mysqldump

mysqldump -uroot -pabc123 qida_prd_20151122_1753 >qida_prd_20151124_0013.sql

mysql -uroot -p qida2_t001<F:asp db backupmysqlsql script1511qd_shop.sql

查询死锁等

show processlist;

给表加索引

ALTER TABLE `income` ADD INDEX uid ( `uid` ) ;

update from

update `log` a inner join `logs` b on a.`accountuin` = b.`accountuin`
set a.`uin` = b.`uin` where a.`accountuin` = b.`accountuin`