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Oracle number date varchar2字段类型占用空间大小

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Release: 2016-06-07 17:38:08
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oracledate类型占用存储空间是7个字节oraclevarchar2类型占用存储空间是每个字符占用一个字节oraclenumber类型占用存储空间是几个字节number最少占用两个字节,

oracle date类型占用存储空间是7个字节


oracle varchar2类型占用存储空间是每个字符占用一个字节


oracle number类型占用存储空间是几个字节

number最少占用两个字节,以后每增加两位数就增加一个字节,,最多占用21个字节

例 NUMBER(20)

计算方式

select floor((20+1)/2)+1 from dual;

FLOOR((20+1)/2)+1

-----------------

11


oracle number date varchar2


Leonarding

2013.11.06

北京&autumn

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