sql standard	sqlserver	postgresql	postgresql aliases	description
bigint	bigint	bigint	int8	signed eight-byte integer：有符号8字节整数
		bigserial	serial8	autoincrementing eight-byte integer：自增属性的 bigint
bit	binary	bit [ (n) ]		fixed-length bit string：定长位串
bit varying	varbinary	bit varying [ (n) ]	varbit	variable-length bit string：变长位串
boolean	bit	boolean	bool	logical boolean (true/false)：布尔值
		box		rectangular box on a plane
		bytea		binary data ("byte array")
character varying	varchar	character varying [ (n) ]	varchar [ (n) ]	variable-length character string：变长字符串（长度有限制）
varchar
character	char	character [ (n) ]	char [ (n) ]	fixed-length character string：定长字符串
char
		cidr		ipv4 or ipv6 network address
		circle		circle on a plane
date	date	date		calendar date (year, month, day)：日期（仅）
double precision	float()	double precision	float8	double precision floating-point number (8 bytes)：双精度8字节浮点数
		inet		ipv4 or ipv6 host address
integer	int	integer	int, int4	signed four-byte integer：有符号4字节整数【一般意义上的整数】
inteval		interval [ fields ] [ (p) ]		time span：时间间隔值
		line		infinite line on a plane
		lseg		line segment on a plane
		macaddr		mac (media access control) address
	money	money		currency amount
numeric	numeric	numeric [ (p, s) ]	decimal [ (p, s) ]	exact numeric of selectable precision：高精度定点数
decimal	decimal
		path		geometric path on a plane
		point		geometric point on a plane
		polygon		closed geometric path on a plane
real	real float()	real	float4	single precision floating-point number (4 bytes)：单精度4字节浮点数
smallint	smallint	smallint	int2	signed two-byte integer：小整数
		smallserial	serial2	autoincrementing two-byte integer：自增属性的smallint
		serial	serial4	autoincrementing four-byte integer：自增属性的int
	text varchar(max)	text		variable-length character string：变长大字符串（长度足够大）
time without time zone	time	time [ (p) ] [ without time zone ]		time of day (no time zone)：一天内的时间值，无时区
time with time zone		time [ (p) ] with time zone	timetz	time of day, including time zone：一天内的时间值，有时区
timestamp without time zone	datetime	timestamp [ (p) ] [ without time zone ]		date and time (no time zone)：日期时间，无时区
	datetime2
timestamp with time zone	datetimeoffset	timestamp [ (p) ] with time zone	timestamptz	date and time, including time zone：日期时间，有时区
		tsquery		text search query
		tsvector		text search document
		txid_snapshot		user-level transaction id snapshot
	uniqueidentifier	uuid		universally unique identifier：唯一标识类型
xml	xml	xml		xml data：xml数据类型
		json		json data
21	21	39	15	39