SQL Server Management Studio 中浮点类型的全精度输出

2022-01-09 00:00:00 floating-point sql-server ssms

我的值 1555.4899999999998 以默认精度 (53) 存储在 float 列中.当我执行一个简单的 select 时，SSMS 会舍入输出而不是使用所有可用的精度打印它.它最近给我造成了一些问题，因为打印的值不能作为 float 文字来匹配实际存储的值.

I have the value 1555.4899999999998 stored in a float column with default precision (53). When I do a simple select, SSMS rounds the output instead of printing it with all available precision. It's caused some gotchas for me recently since the value printed doesn't work as a float literal to match the actual stored value.

例如(请注意，这两个数字在默认的 float 中都有精确的表示)，

For example (note that both of these numbers have an exact representation in the default float),

declare @f1 float;
declare @f2 float;
set @f1 = 1555.49;
set @f2 = 1555.4899999999998;
select @f1, @f2;
select STR(@f1,30,15), STR(@f2,30,15);

输出:

1555.49 1555.49
1555.490000000000000    1555.489999999999800

在查询分析器中，第一个 select 输出:

In Query Analyzer, that first select outputs:

1555.49 1555.4899999999998

这就是我想从 Management Studio 获得的行为.有没有办法防止 SSMS 在其结果显示中四舍五入?

That's the behavior I want to get from Management Studio. Is there a way to prevent SSMS from rounding in its result display?

推荐答案

没有.

SQL Server Management Studio 为显示目的对浮点值进行舍入；有一个连接建议改变此行为，但按设计"已关闭.(Microsoft Connect，Microsoft 软件的公共问题跟踪器已停用)

SQL Server Management Studio rounds floating point values for display purposes; there is a Connect suggestion to change this behavior, but it is closed "as By Design". (Microsoft Connect, a public issue tracker for Microsoft software has been retired)

但是，SQLCMD、osql 和查询分析器不支持.

However, SQLCMD, osql and the Query Analyzer do not.

SQLCMD -E -S server -Q"SELECT CONVERT(FLOAT, 1555.4899999999998)"

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