原文:关于powerdesigner中的data types说明

这一堆的数据类型看着真是头大，弄个表格对照一下。

Numeric data types

Standard datatype	DBMS-specific physical data type	Content	Length
Integer	int / INTEGER	32-bit integer	—
Short Integer	smallint / SMALLINT	16-bit integer	—
Long Integer	int / INTEGER	32-bit integer	—
Byte	tinyint / SMALLINT	256 values	—
Number	numeric / NUMBER	Numbers with a fixed decimal point	Fixed
Decimal	decimal / NUMBER	Numbers with a fixed decimal point	Fixed
Float	float / FLOAT	32-bit floating point numbers	Fixed
Short Float	real / FLOAT	Less than 32-bit point decimal number	—
Long Float	double precision / BINARY DOUBLE	64-bit floating point numbers	—
Money	money / NUMBER	Numbers with a fixed decimal point	Fixed
Serial	numeric / NUMBER	Automatically incremented numbers	Fixed
Boolean	bit / SMALLINT	Two opposing values (true/false; yes/no; 1/0)	—

Character data types 

The following character data types are available:

Standard data type	DBMS-specific physical data type	Content	Length
Characters	char / CHAR	Character strings	Fixed
Variable Characters	varchar / VARCHAR2	Character strings	Maximum
Long Characters	varchar / CLOB	Character strings	Maximum
Long Var Characters	text / CLOB	Character strings	Maximum
Text	text / CLOB	Character strings	Maximum
Multibyte	nchar / NCHAR	Multibyte character strings	Fixed
Variable Multibyte	nvarchar / NVARCHAR2	Multibyte character strings	Maximum

Time data types 

Standard data type	DBMS-specific physical data type	Content	Length
Date	date / DATE	Day, month, year	—
Time	time / DATE	Hour, minute, and second	—
Date & Time	datetime / DATE	Date and time	—
Timestamp	timestamp / TIMESTAMP	System date and time	—

The following other data types are available:

Standard data type	DBMS-specific physical data type	Content	Length
Binary	binary / RAW	Binary strings	Maximum
Long Binary	image / BLOB	Binary strings	Maximum
Bitmap	image / BLOB	Images in bitmap format (BMP)	Maximum
Image	image / BLOB	Images	Maximum
OLE	image / BLOB	OLE links	Maximum
Other	—	User-defined data type	—
Undefined	undefined	Undefined. Replaced by the default data type at generation.	—