yyyy-MM-dd
select left('2013-12-13 14:15:16',10)
hh:mm:ss
select right('2013-12-13 14:15:16',8)
MM
select substring('2013-12-13 14:15:16',6,2)
ss
select substring('2013-12-13 14:15:16',-2)
mm
select substring('2013-12-13 14:15:16',-5,2)
www.iteye
select substring_index('www.iteye.com','.',2)
www
select substring_index('www.iteye.com','.',1)
com
select substring_index('www.iteye.com','.',-1)
www.iteye.com
select substring_index('www.iteye.com','.cn',-1)
select ltrim(' abc ')
select rtrim(' abc ')
select trim(' abc ')
select trim(leading 'x' from 'xxxbarxxx');
select trim(trailing 'x' from 'xxxbarxxx');
select trim(both 'x' from 'xxxbarxxx');
select replace('2012-12-12','12',11)
--替换image.cache为image
update db_sols set url = replace(url,"image.cache","image")
select insert('2012-12-12',9,2,'11')
select reverse('2012-12-12')
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