Question

正如问题所示，我需要向上或向下舍入到最接近的20，除了0-14之外的数字，所有必须舍入到20，因为不允许零值。表格不需要更新新的值。现在我只管理了向上或向下舍入到最接近的100，如下所示：

 CASE WHEN ROUND(number,-2)=0 THEN CAST(ROUND(number,-2)+100 AS DECIMAL(18, 0)) 
      ELSE CAST(ROUND(number,-2) AS DECIMAL(18,0)) END AS [NUMBER]

Answer 1

试试这个：

DECLARE @testValue Int = 35;

SELECT
  CASE
    WHEN @testValue BETWEEN 0 AND 14 THEN 20
    ELSE ROUND((@testValue * 1.0) / 20, 0) * 20
  END MyRoundedValue;

可能有更优化的方法，但这是第一个想到的解决方案。 * 1.0是强制转换为浮点数，以便/ 20生成小数结果。结果使用ROUND四舍五入，然后乘以20得到最终的“舍入”值。

已编辑将0-14的特殊情况考虑在内......

Answer 2

这将有效：

--N = Your nearest number
--X = Number to round
SELECT ROUND(X/N, 0) * N

示例用法：

DECLARE @numberToRound INT;
SET @numberToRound = 25;

CASE WHEN @numberToRound BETWEEN 0 AND 14 THEN
    20
ELSE
    ROUND((CAST(@numberToRound AS DECIMAL) / 20.00), 0) * 20
END

Answer 3

我更喜欢整数除法^*，如果number是整数，我的解决方案可能是这样的：

CASE
  WHEN number BETWEEN 0 AND 14 THEN 20  /* actually, it seems to make more sense
                                           to have the range as BETWEEN 0 AND 9,
                                           because values from 10 to 14 would be
                                           converted to 20 with the ELSE branch
                                           anyway */
  ELSE (number + 10) / 20 * 20
END

_{^*当两个操作数都是整数时，SQL Server使用整数除法。}

向上或向下舍入到最接近的20

3 个答案: