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我从 DB2 获取数据时遇到问题。我想按客户汇总发票金额。在一个字段中，（计算 - 我称之为 InvoicedThisYear）它计算出今年开具的发票，而在另一个领域，它计算出上一年开具的发票（计算，我称之为 InvoicedLastYear）。但是，正如总结的那样，我已按客户对其进行分组，但它也需要按 InvoiceYear 分组的数据，因此我必须将其包含在分组中。我的问题是在我的结果中，我现在在没有数据和重复的年份中为零，例如：

Cust     InvoicedThisYear   InvoiceLastYear
abc          0                 100
abc          100                0

理想情况下我希望看到

Cust   InvoicedThisYear     InvoicedLastYear
abc        100                  100

这是我的代码：

SELECT 
   Cust AS Customer,
   (CASE WHEN InvoiceYear = Year(Current Date) THEN sum(InvoiceAmt)ELSE 0 END) as InvoicedThisYear,
   (CASE WHEN InvoiceYear = year(Current Date)-1 THEN sum(InvoiceAmt)ELSE 0 END) as InvoicedLastYear
FROM 
    InvHead
GROUP BY 
   Cust, 
   InvoiceYear
HAVING
   ((CASE WHEN InvoiceYear = Year(Current Date) THEN sum(InvoiceAmt)ELSE 0 END)<>0)
   OR
   ((CASE WHEN InvoiceYear = year(Current Date)-1 THEN sum(InvoiceAmt)ELSE 0 END)<>0)
ORDER BY 
   Cust

我怎样才能得到想要的结果？如果我删除 groupby Invoice Year，查询将不会运行

作为大小说明，它可以在 MS Access 中使用，无需按发票年份分组！

谢谢，

迈克尔

4

1 回答 1

3

您需要将SUM()case 语句放在周围：

SELECT 
   Cust AS Customer,
   sum(CASE WHEN InvoiceYear = Year(Current Date) THEN InvoiceAmt ELSE 0 END) as InvoicedThisYear,
   sum(CASE WHEN InvoiceYear = year(Current Date)-1 THEN InvoiceAmt ELSE 0 END) as InvoicedLastYear
FROM 
    InvHead
GROUP BY 
   Cust
ORDER BY 
   Cust
于 2013-06-28T17:40:22.447 回答