Question

我正在处理一个带有“ 2015年费用”，“ 2015年收入”，“ 2016年费用”，“ 2016年收入”等列的单个仓库表。我需要将它们分成“收入”，“费用” ，然后对“结算年份”进行一些分析。许多记录都有多年的收费和收入。

我尝试过的CASE语句仅在第一年生效，但我需要在所有年份都生效。

这是我的案件陈述：

    (CASE when 2015_revenue IS NOT NULL then 2015_revenue
        when 2016_revenue_$ IS NOT NULL then 2016_revenue
       END) as revenue,
(CASE when 2015_fee IS NOT NULL then 2015_fee
    when 2016_fee IS NOT NULL then 2016_fee
  END) as fee, 
(CASE when 2015_revenue IS NOT NULL then '2015'
        when 2015_fee IS NOT NULL then '2015'
        when 2016_revenue IS NOT NULL then '2016'
        when 2016_fee IS NOT NULL then '2016'
        end) as bill_year

有什么想法吗？

Answer 1

这不是CASE语句，它正在创建带有UNION的临时表并加入该表：

    SELECT p1.[bunch of fields from table]
    amts.fee
    amts.revenue
    amts.bill_year
    FROM table p1
    JOIN (SELECT id, 2015_revenue as revenue, 2015_fee as fee, '2015' as bill_year FROM table
           UNION
           SELECT id, 2016_revenue as revenue, 2016_fee as fee, '2016' as bill_year FROM table
           U) amts on amts.id = p1.id;

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