Oracle数据库对象类型和列数据类型概述
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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