ms-access 查询需要连接编号或计数
Posted
技术标签:
【中文标题】ms-access 查询需要连接编号或计数【英文标题】:ms-access query needs to concatenate the numbering or counting 【发布时间】:2017-10-24 10:28:21 【问题描述】:餐桌上的水果
FName
-----
orange
apple
apple
3mango
orange
orange
apple
mango
我想要一个计算结果的查询。
orange-1
apple-1
apple-2
mango-1
orange-2
orange-3
apple-3
mango-2
【问题讨论】:
顺序是如何定义的?有 ID 列吗? Table Fruits FName ----- orange apple apple mango orange orange apple mango ----- 我想要一个查询结果与计算。橙1 苹果1 苹果2 芒果1 橙2 橙3 苹果3 芒果2 您好,如果您的问题已为您解答,请标记“已回答”。 【参考方案1】:在 MS SQL Server 中将是一个简单的ROW_NUMBER()
窗口函数,因此您只需要在 MS Access 中等效。但为此,您需要在表中添加一个id
列,因为您需要进行自加入。
解决方案也在这里:Achieving ROW_NUMBER / PARTITION BY in MS Access
declare @tbl as table (
id int
,fname varchar(15)
)
insert into @tbl values (1,'orange')
insert into @tbl values (2,'apple')
insert into @tbl values (3,'apple')
insert into @tbl values (4,'mango')
insert into @tbl values (5,'orange')
insert into @tbl values (6,'orange')
insert into @tbl values (7,'apple')
insert into @tbl values (8,'mango')
SELECT
t1.id
,t1.fname
,COUNT(*) AS [Ino Seq]
FROM
@tbl AS t1
INNER JOIN
@tbl AS t2
ON t2.fname = t1.fname
and t1.id >= t2.id
GROUP BY t1.id, t1.fname
【讨论】:
【参考方案2】:如果你添加一个ID(自动编号),你可以使用这个功能,以水果名称作为组键:
Public Function RowCounter( _
ByVal strKey As String, _
ByVal booReset As Boolean, _
Optional ByVal strGroupKey As String) _
As Long
' Builds consecutive RowIDs in select, append or create query
' with the possibility of automatic reset.
' Optionally a grouping key can be passed to reset the row count
' for every group key.
'
' Usage (typical select query):
' SELECT RowCounter(CStr([ID]),False) AS RowID, *
' FROM tblSomeTable
' WHERE (RowCounter(CStr([ID]),False) <> RowCounter("",True));
'
' Usage (with group key):
' SELECT RowCounter(CStr([ID]),False,CStr[GroupID])) AS RowID, *
' FROM tblSomeTable
' WHERE (RowCounter(CStr([ID]),False) <> RowCounter("",True));
'
' The Where statement resets the counter when the query is run
' and is needed for browsing a select query.
'
' Usage (typical append query, manual reset):
' 1. Reset counter manually:
' Call RowCounter(vbNullString, False)
' 2. Run query:
' INSERT INTO tblTemp ( RowID )
' SELECT RowCounter(CStr([ID]),False) AS RowID, *
' FROM tblSomeTable;
'
' Usage (typical append query, automatic reset):
' INSERT INTO tblTemp ( RowID )
' SELECT RowCounter(CStr([ID]),False) AS RowID, *
' FROM tblSomeTable
' WHERE (RowCounter("",True)=0);
'
' 2002-04-13. Cactus Data ApS. CPH
' 2002-09-09. Str() sometimes fails. Replaced with CStr().
' 2005-10-21. Str(col.Count + 1) reduced to col.Count + 1.
' 2008-02-27. Optional group parameter added.
' 2010-08-04. Corrected that group key missed first row in group.
Static col As New Collection
Static strGroup As String
On Error GoTo Err_RowCounter
If booReset = True Then
Set col = Nothing
ElseIf strGroup <> strGroupKey Then
Set col = Nothing
strGroup = strGroupKey
col.Add 1, strKey
Else
col.Add col.Count + 1, strKey
End If
RowCounter = col(strKey)
Exit_RowCounter:
Exit Function
Err_RowCounter:
Select Case Err
Case 457
' Key is present.
Resume Next
Case Else
' Some other error.
Resume Exit_RowCounter
End Select
End Function
查看内嵌 cmets 了解典型用法。
【讨论】:
以上是关于ms-access 查询需要连接编号或计数的主要内容,如果未能解决你的问题,请参考以下文章
提高计算 MS-Access 中大型数据集 7 天滚动平均值的查询的性能
为啥 MS-Access 中的 Teradata 查询比 SQL Server 更快