T-SQL联合（不同，不是全部）和按优先级排序

Question

假设我有一个包含3个值的Tag表（Id int和Name nvarchar(100)）：

1 Software
2 Hardware
3 Warehouse

现在，我想用关键字查询，并将以关键字开头的关键字优先于包含关键字的关键字。所以起初我写这个查询：

SELECT 0 AS SortCol, * 
FROM Tag T
WHERE CHARINDEX(@keyword, T.Name) = 1
UNION
SELECT 1 AS SortCol, * 
FROM Tag T
WHERE T.Name LIKE ('%' + @keyword + '%')
ORDER BY SortCol, Name;

但是，由于SortCol列不再使它们区别（Warehouse值出现两次，因为两者均正确），因此无法正常工作。

那是我认为我需要通过摆脱该列来手动调用DISTINCT的原因：

SELECT DISTINCT T2.Id, T2.Name
FROM
    (SELECT 0 AS SortCol, * 
     FROM Tag T
     WHERE CHARINDEX(@keyword, T.Name) = 1
     UNION
     SELECT 1 AS SortCol, * 
     FROM Tag T
     WHERE T.Name LIKE ('%' + @keyword + '%')
     ORDER BY SortCol, T.Name) AS T2;

但是，这不起作用，因为出现此错误：

  

除非还指定了TOP，OFFSET或FOR XML，否则ORDER BY子句在视图，内联函数，派生表，子查询和公用表表达式中无效。

我在这里想念什么？如何在两个语句中将UNION与ORDER BY一起使用？

Answer 1

您不需要可以使用的UNION

SELECT *
FROM   Tag T
WHERE  T.Name LIKE '%' + @keyword + '%'
ORDER  BY CASE WHEN T.Name LIKE @keyword + '%' THEN 0 ELSE 1 END,
          Name; 

Answer 2

如果出于某些原因您需要此SortCol列，则可以：

DECLARE @keyword NVARCHAR(MAX) = N'ware';

WITH cte AS (
  SELECT *, ROW_NUMBER() OVER(PARTITION BY Name ORDER BY Name) rn
  FROM (
    SELECT 0 AS SortCol, * 
    FROM Tag T
    WHERE CHARINDEX(@keyword, T.Name) = 1
    UNION
    SELECT 1 AS SortCol, * 
    FROM Tag T
    WHERE T.Name LIKE ('%' + @keyword + '%')) s
)
SELECT SortCol, Id, name
FROM cte
WHERE rn = 1
ORDER BY SortCol, Name;

db<>fiddle demo

Answer 3

只需将一个CASE直接放在ORDER BY子句中，例如：

If i = 0 Then 'No worksheet with the year selected by DTPicker
    With Sheets("Template")
        .Copy After:=Sheets(Sheets.Count) 'Add worksheet
        i = 1
        ActiveSheet.Name = WsName & "_" & i
    End With
ElseIf
    For counter = 1 To i Step 1
        Worksheets(WsName & "_" & counter).Activate
        If IsEmpty(Range("A1048576").value) = True Then
        Exit For
        End If
    Next counter
Else
    With Sheets("Template")
        .Copy After:=Sheets(Sheets.Count) 'Add worksheet
        ActiveSheet.Name = WsName & "_" & i
    End With
End If