Question

http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc38151.1540/doc/html/san1278453173757.html

Adaptive Server Enterprise不支持TRUNCATE和TRUNCNUM函数。

有没有人知道在ASE中这样做的另一种方式？

由于

Answer 1

我知道这些方法：

select Number = floor ( 455.443 )
select Number = cast ( 455.443 as int )
select Number = convert ( int, 455.443 )
select Number = 455.443 - ( 455.443 % 1 )

Answer 2

如何使用Floor功能？它基本上做同样的事情，并在ASE中得到支持。

Answer 3

这是一个古老的问题，但我几天前做过这样的事情来模仿＆＃34; truncnum＆＃34;上面链接中描述的功能。

create function custom_truncnum(@numberToTruncate float, @decimalPlaces int)
returns float
AS
    declare @tenToTheXPower float;
    declare @leftSideOfDecimal float;
    declare @returnVal float;

    set @tenToTheXPower = power(10, ABS(@decimalPlaces);
    set @leftSideOfDecimal = FLOOR(@numberToTruncate);

    if (@decimalPlaces <= 0)
        set @returnVal = FLOOR(@numberToTruncate / @tenToTheXPower) * @tenToTheXPower;
    else
        set @returnVal = @leftSideOfDecimal + (FLOOR(@numberToTruncate - @leftSideOfDecimal) * @tenToTheXPower) / @tenToTheXPower);

    return @returnVal;
GO

现在，您应该可以在Sybase ASE中执行此操作：

SELECT dbo.custom_truncnum(345.567, 2) 
    345.56

SELECT dbo.custom_truncnum(345.562, 2) 
    345.56

SELECT dbo.custom_truncnum(345.567, -1) 
    340

SELECT dbo.custom_truncnum(345.567, -2) 
    300

SELECT dbo.custom_truncnum(345.567, 0)  --This is the same as FLOOR(345.567)
    345

如何截断sybase ASE中的数字？

3 个答案: