PowerDesigner的数据类型

用PowerDesigner 15 设计个数据库，每个字段的数据类型设计真是头大，根据字段意思看用哪个类型最合适还得仔细研究呀。贴几个数据类型表格收藏一下^_^

　　

Numeric data types
Standard datatypeDBMS-specific physical data typeContentLength
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 typeDBMS-specific physical data typeContentLength
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 typeDBMS-specific physical data typeContentLength
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 —

Other data types 

The following other data types are available:

 

Standard data typeDBMS-specific physical data typeContentLength
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. —
posted @ 2013-09-06 10:36  CIWang  阅读(13747)  评论(0)  编辑  收藏  举报