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Oracle数据库对象类型和列数据类型概述

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2016-06-07 17:02:321217browse

归类数据库主要的数据类型 All object hava a name and atype, and each object is owned by a schema. --查询数据库的主要对象类

NUMBER

precision(1-38)   sacle(-84,127)

NUMBER ( precision, scale)
    precision表示数字中的有效位。如果没有指定precision的话,Oracle将使用38作为精度。
    scale表示数字小数点右边的位数,scale默认设置为0.  如果把scale设成负数,Oracle将把该数字取舍到小数点左边的指定位数。

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