相关疑难解决方法(0)

在开发过程中遇到了相当奇怪的SQL Server行为.在这里,绝对相同的数字我们有完全相同的公式.唯一的区别是我们如何得到这个数字(4.250).从表,临时表,变量表或硬编码值.在所有情况下,圆角和铸造都是完全相同的.

-- normal table
CREATE TABLE [dbo].[value]
(
[val] [decimal] (5, 3) NOT NULL
) 
INSERT INTO [value] VALUES (4.250 )
SELECT ROUND(CAST(val * 0.01 / 12 AS DECIMAL(15, 9)), 9) AS val FROM [value] AS pr

-- inline query from normal table
SELECT * FROM (SELECT ROUND(CAST(val * 0.01 / 12 AS DECIMAL(15, 9)), 9) AS val FROM [value] AS pr) a

-- record without table
SELECT ROUND(CAST(4.250 * 0.01 / 12 AS DECIMAL(15, 9)), 9) AS val …