数据库数据类型对照表

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SQL-92	SYBASE	SQL SERVER	ORACLE	POSTGRES
character type
character	char(n)	char(n)	char(n)	char(n)
character varying	varchar(n)	varchar(n)	varchar2(n)	varchar(n)
N/A	nchar(n),nvarchar(n)	N/A	N/A
national character	unichar(n)	nchar(n)	nchar(n)
	boolean			boolean/bool
Date/ time type
rowversion	timestamp	timestamp	timestamp	timestamptz
N/A	datetime	datetime	date	date
N/A	smalldatetime	smalldatetime	date	date
N/A	date	N/A	date	date
N/A	time	N/A	date	timetz
integer type
integer	int	int	integer	int,int4
N/A	smallint,tinyint	smallint,tinyint,bigint	N/A	bigint,int8
Decimal type
Decimal	numeric(p,s)	numeric(p,s)	number(p,s)/decimal(p,s)	decimal(p,s)
N/A	decimal(p,s)	decimal(p,s)	number(p,s)/decimal(p,s)	decimal(p,s)
N/A	double	double	number	float8
N/A	float	float	float	float4
N/A	real	real	real	float4
other type
N/A	money,smallmoney	money,smallmoney	N/A	money
nation text	text	text	clob	serial4,text
N/A	N/A	ntext	nclob
N/A	image	image	blob
bit/nbit	bit	bit	bit	varbit