书说:
number(6,3) Oracle allows for 2 not 6 significant digitalis.
我的问题是,6意味着精确.这意味着有效位数.所以它应该接受6位有效数字.为什么这本书说这是2位有效数字
我所指的那本书是Oracle Database 11g A Beginner’s Guide by McGraw Hill Professional,Dec 18,2008,第12页
p is the precision,or the maximum number of significant decimal
digits,where the most significant digit is the left-most nonzero
digit,and the least significant digit is the right-most known digit.
Oracle guarantees the portability of numbers with precision of up to
20 base-100 digits,which is equivalent to 39 or 40 decimal digits
depending on the position of the decimal point.s is the scale,or the number of digits from the decimal point to the
least significant digit. The scale can range from -84 to 127.Positive scale is the number of significant digits to the right of the
decimal point to and including the least significant digit.Negative scale is the number of significant digits to the left of the decimal point,to but not including the least significant digit. For negative scale the least significant digit is on the left side of the decimal point,because the actual data is rounded to the specified number of places to the left of the decimal point. For example,a specification of (10,-2) means to round to hundreds.
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。