Question

我有一张付款表。我想根据收据编号选择几列。然后，我想根据一些值显示条件状态列。

我写了一条SQL语句，可以很好地做到这一点：

代码

SELECT 
    [Number], [Name], [Amount],
    CASE 
       WHEN [Downloaded by] IS NULL 
            AND [Request Accepted?] IS NULL 
          THEN 'Sent to Payments'
       WHEN [Downloaded by] IS NOT NULL 
            AND [Request Accepted?] IS NULL
          THEN 'Received by Payments'
       WHEN [Downloaded by] IS NOT NULL
            AND [Request Accepted?] IS NOT NULL 
           THEN 'Sent to Finance'
    END AS 'Real-time Status' 
FROM
    [DB] 
WHERE
    [Request Receipt Id] = 'PR0001'

我正在构建一个表单，用户可以在其中滚动浏览这些值，并且希望显示数据库中的另一列。但是，我不想在主搜索框中显示此列。因此，我将搜索框设置为仅包含4x列（“数字”，“名称”，“金额”和“实时状态”）。

这个想法是，如果我有第5列，除非他们单击它，否则它将不会显示在主用户窗体中，并且它将出现在另一个框中。

我的问题是设置此SQL语句以根据需要组织数据：

[Number], [Name], [Amount], [Real-time Status], [Description]

我用来执行此操作的代码是：

SELECT 
    [Number], [Name], [Amount],
    CASE 
       WHEN [Downloaded by] IS NULL 
            AND [Request Accepted?] IS NULL 
          THEN 'Sent to Payments'
       WHEN [Downloaded by] IS NOT NULL 
            AND [Request Accepted?] IS NULL
          THEN 'Received by Payments'
       WHEN [Downloaded by] IS NOT NULL
            AND [Request Accepted?] IS NOT NULL 
           THEN 'Sent to Finance'
    END AS 'Real-time Status' 
FROM
    TEP_Payments_Table 
WHERE 
    [Request Receipt Id] = 'PR0001' 

UNION 

SELECT 
    [Description] 
WHERE 
    [Request Receipt Id] = 'PR0001'

但是，当我尝试这样做时，SQL Server不喜欢它并引发错误。

你们能告诉我我要去哪里错了，什么是实现我想要的最有效方法。

谢谢

Answer 1

如果所有数据都来自一个表，则只需在查询中添加描述字段。

        SELECT [Number],[Name],[Amount],
        CASE WHEN [Downloaded by] is null and [Request Accepted?] is null then 'Sent to Payments'
        WHEN [Downloaded by] is not null and [Request Accepted?] is null then 'Received by Payments'
        When [Downloaded by] is not null and [Request Accepted?] is not null then 'Sent to Finance'
        END as 'Real-time Status',
        Description
     from TEP_Payments_Table where [Request Receipt Id] = 'PR0001'

使用CASE和联合[TSQL]选择

1 个答案: