mysql日期函数 和sql语句扩展information_schema show processlist;

SELECT NOW();

SELECT CURDATE();

SELECT YEAR(NOW())

SELECT CONCAT("mysqldump ","-uroot ","-p123 ",table_schema," ",table_name,">/tmp/",table_schema,"_",table_name,".sql") 
FROM information_schema.tables
WHERE table_schema='world'
INTO OUTFILE '/tmp/world_bak.sh'

SHOW GLOBAL STATUS LIKE '%innodb%'

显示连接诶状态

SHOW GLOBAL VARIABLES LIKE '%log%';

show processlist;

显示连接数