rails 数据类型对比 mysql postgresql sqlite

Rails	mysql	postgresql	sqlite
binary	blob	bytea	blob
boolean	tinyint(1)	boolean	boolean
date	date	date	date
datetime	datetime	timestamp	datetime
decimal	decimal	decimal	decimal
float	float	float	float
integer	int(11)	integer	integer
string	varchar(255)	*	varchar(255)
text	text	text	text
time	time	time	datetime
timestamp	datetime	timestamp	datetime