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  • 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.
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  • 原文地址:https://www.cnblogs.com/ThinkWorld/p/3304975.html
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