Question

我正在努力尝试获取一个SQL查询，只显示两位小数。不幸的是，它是一个非常复杂的查询和＆＃34;十进制（18,2）＆＃34;的每个组合。我试过的不起作用。

SELECT DISTINCT 
                 Company_Name AS Company, CASE WHEN isnull((CAST(IsNull(SUM(Margin), 0) / CASE isnull(SUM(invoiceamt), 0) WHEN 0 THEN 1 ELSE SUM(invoiceamt) 
                 END * 100 AS decimal(18, 2)) / 70), 0) < 0 THEN 0 ELSE (CAST(IsNull(SUM(Margin), 0) / CASE isnull(SUM(invoiceamt), 0) 
                 WHEN 0 THEN 1 ELSE SUM(invoiceamt) END * 100 AS decimal(18, 2)) / 70) END * 100 AS Service_Goal
FROM            v_cbi_Agr_Mo_Billing_History3
WHERE        (1 = 1) AND (dbo.udf_cbi_InternalCompanyName() <> Company_Name) AND (DATEDIFF(mm, GETDATE(), MonthStart) BETWEEN 0 AND 0) AND 
                 (AGR_Type_Desc IN ('Agreement1', 'Agreement2', 'Agreement3'))
GROUP BY Company_Name
HAVING        (SUM(Margin) <> 0) OR
                 (SUM(InvoiceAmt) <> 0)
ORDER BY Company

Answer 1

问题是您将此块作为小数转换然后除以70，这会产生更多的小数位。

Cast(Isnull(Sum(@margin), 0) / CASE Isnull(Sum(@invoiceamt), 0) 
                                    WHEN 0 THEN 1 
                                    ELSE Sum(@invoiceamt) 
                                  END * 100 AS DECIMAL(18, 2))

您可以将其更改为执行所有calulcations的操作，然后将其转换为小数（10,2）。我不确定你是怎么想要这一切的。

Cast(Isnull(Sum(@margin), 0) / CASE Isnull(Sum(@invoiceamt), 0) 
                                    WHEN 0 THEN 1 
                                    ELSE Sum(@invoiceamt) 
                                  END * 100 / 70 AS DECIMAL(18, 2))

Answer 2

尝试将表达式的结果转换为所需的精度。（内部强制转换用于避免整数除法）。

例如：

select 
    cast( 100 / cast(77 as decimal(10,2) ) as decimal(10,2) ), 
    100/cast(77 as decimal(10,2))

输出：

--------------------------------------- ---------------------------------------
1.30                                    1.29870129870

使用Cast时的十进制舍入问题

2 个答案: