Question

我正在尝试使用这些查询为查询结果添加默认值“选择餐厅” ；

SELECT * FROM(
SELECT No_,Name + ' - ' + No_ Name FROM [dbo].[TestDB]
UNION
SELECT '<Choose a Restaurant>' AS Name) A
WHERE [Alt Grup] = 'TAB' or [Alt Grup] = 'FRC' or [Alt Grup] = 'KIB' or [Alt Grup] = 'ORK')
       and (Blocked = 0)
       and ([Chain Name] = '01-TAB' or [Chain Name] = 'YURT DIŞI' or [Chain Name] = 'FAS')
       and [Show On Web] = 1
       and No_ != '2001.10.01.000998'
ORDER BY Name

但是，它不会成功。我做错了什么？预先感谢。

编辑：这是我编辑原始查询以强制Union;

select No_,Name + ' - '+No_ Name, 'Choose a Rest' from [dbo].[TestDB]
where ([Alt Grup] = 'TAB' or [Alt Grup] = 'FRC' or [Alt Grup] = 'KIB' or [Alt Grup] = 'ORK')
       and (Blocked = 0)
       and ([Chain Name] = '01-TAB' or [Chain Name] = 'YURT DIŞI' or [Chain Name] = 'FAS')
       and [Show On Web] = 1
       and No_ != '2001.10.01.000998'
order by Name

Answer 1

您在第一次选择时有错误的列名顺序（似乎是两列，但是 No_名称似乎有误）

  No_, Name + ' - ' + No_ Name FROM [dbo].[TestDB]

对于UNION，两个选择中都需要相同的编号和相应的数据类型列，因此您可以尝试

SELECT * 
FROM(
  SELECT 'No_' + Name + ' - ' + No_ + Name AS name
  FROM [dbo].[TestDB] 
  UNION
  SELECT '<Choose a Restaurant>' 
) A

ORDER BY Name

，您可以在WHERE子句中仅使用表中存在的列名（子查询（）A）你有因此，您只能过滤名称..

的值

Answer 2

您的查询有几个问题。我会按照这些思路将其重组为更多内容。

SELECT No_
    , Name + ' - ' + No_ Name 
FROM [dbo].[TestDB]
WHERE [Alt Grup] in ('TAB', 'FRC', 'KIB', 'ORK')
    and Blocked = 0
    and [Chain Name] in ('01-TAB', 'YURT DIŞI', 'FAS')
    and [Show On Web] = 1
    and No_ != '2001.10.01.000998'

UNION ALL

SELECT NULL
    , '<Choose a Restaurant>' AS Name
ORDER BY Name

不能与where子句一起使用

2 个答案: