SQL 查询中的计数器列答案

【问题标题】：Counter column in a SQL QuerySQL 查询中的计数器列
【发布时间】：2016-05-18 09:26:02
【问题描述】：

我有两个表，我通过 INNER JOIN 链接。它们是 Invoice Header 表和 Invoice Lines 表。

我想添加的是某种计数器列，它会为每个唯一的发票编号给我一个 1，而如果发票有多个行项目，则为任何重复的发票编号给我一个 0。然后，当我稍后分析我的数据时，它将允许我对 Excel 中的各个列进行计数。基本上是计数，但只在左表的记录上，忽略右表。

我只是不知道如何使用 COUNT() 或 CASE 来使其工作。有可能吗？

这是我的查询：

SELECT P.DocNum
     , L.LineNum
     , P.DocCur
     , P.DocTotalFC
     , P.DocTotal
     , CASE 
         WHEN LEFT(L.AcctCode, 1) = '7'  THEN 'Admin'
         WHEN LEFT(L.AcctCode, 2) = '15' THEN 'Admin'
         WHEN L.AcctCode = '11501'       THEN 'MX'
         WHEN LEFT(L.Project, 1) = 'W'   THEN 'MX'
         WHEN L.OcrCode2 = '570'         THEN 'MEC'
         WHEN L.OcrCode2 = '590'         THEN 'ZHU'
         ELSE 'Flight Ops'
       END AS 'Type'
     , L.AcctCode AS 'Account'
     , L.OcrCode  AS 'Aircraft'
     , L.OcrCode2 AS 'Department'
     , L.OcrCode3 AS 'Business Unit'
     , L.Project  AS 'Project'               
     , L.LineTotal
FROM OPCH P
   INNER JOIN PCH1 L ON P.DocEntry = L.DocEntry
WHERE P.DocDate BETWEEN '2016-01-01' AND '2016-03-31'  
ORDER BY P.DocNum, L.LineNum

高度赞赏任何提示。

提前致谢。

【问题讨论】：

发票号是哪一个？哪个版本的SQL Server？
发票编号为DocNum字段。服务器是 SQL Server 2008。Sagi 的分区上的 row_number 可以解决问题:)

标签： sql-server count inner-join

【解决方案1】：

我认为你需要的是 ROW_NUMBER() 而不是 COUNT() ：

SELECT P.DocNum
     , L.LineNum
     , P.DocCur
     , P.DocTotalFC
     , P.DocTotal
     , CASE 
         WHEN LEFT(L.AcctCode, 1) = '7'  THEN 'Admin'
         WHEN LEFT(L.AcctCode, 2) = '15' THEN 'Admin'
         WHEN L.AcctCode = '11501'       THEN 'MX'
         WHEN LEFT(L.Project, 1) = 'W'   THEN 'MX'
         WHEN L.OcrCode2 = '570'         THEN 'MEC'
         WHEN L.OcrCode2 = '590'         THEN 'ZHU'
         ELSE 'Flight Ops'
       END AS 'Type'
     , L.AcctCode AS 'Account'
     , L.OcrCode  AS 'Aircraft'
     , L.OcrCode2 AS 'Department'
     , L.OcrCode3 AS 'Business Unit'
     , L.Project  AS 'Project'               
     , L.LineTotal
     , CASE WHEN ROW_NUMBER() OVER(PARTITION BY p.docnum ORDER BY p.docDate) > 1
            then 0
            else 1
       end as rnk
FROM OPCH P
   INNER JOIN PCH1 L ON P.DocEntry = L.DocEntry
WHERE P.DocDate BETWEEN '2016-01-01' AND '2016-03-31'  
ORDER BY P.DocNum, L.LineNum

您没有提供足够的详细信息来了解哪一列是唯一发票编号，以及您通过哪一列确定谁是第一个（获得值 1）和重复项（获得值 0）。我使用docnum 作为发票编号，并使用docdate 作为列来确定哪些是重复的，如果需要，请调整它。

如果顺序无关紧要 - 它完全是重复的，并且哪条记录是重复的无关紧要，那么按部分的顺序无关紧要。

【讨论】：

DocNum 是发票编号，正如您正确假设的那样。非常感谢。我知道 row_number() 函数，但不知道“分区依据”技巧。太棒了，谢谢。

【解决方案2】：

由于我不知道基于假设的确切数据，我使用了 Row_number 和 Case 条件，我们可以得到 1 表示正常值，0 表示重复值

SELECT P.DocNum
     , L.LineNum
     , P.DocCur
     , P.DocTotalFC
     , P.DocTotal
     , CASE 
         WHEN LEFT(L.AcctCode, 1) = '7'  THEN 'Admin'
         WHEN LEFT(L.AcctCode, 2) = '15' THEN 'Admin'
         WHEN L.AcctCode = '11501'       THEN 'MX'
         WHEN LEFT(L.Project, 1) = 'W'   THEN 'MX'
         WHEN L.OcrCode2 = '570'         THEN 'MEC'
         WHEN L.OcrCode2 = '590'         THEN 'ZHU'
         ELSE 'Flight Ops'
       END AS 'Type'
     , L.AcctCode AS 'Account'
     , L.OcrCode  AS 'Aircraft'
     , L.OcrCode2 AS 'Department'
     , L.OcrCode3 AS 'Business Unit'
     , L.Project  AS 'Project'               
     , L.LineTotal
     , CASE WHEN ROW_NUMBER()OVER(PARTITION BY  P.DocNum,L.LineNum ORDER BY (SELECT NULL)) = 1 THEN 1 ELSE 0 END SummaryValues
FROM OPCH P
   INNER JOIN PCH1 L ON P.DocEntry = L.DocEntry
WHERE P.DocDate BETWEEN '2016-01-01' AND '2016-03-31'  
ORDER BY P.DocNum, L.LineNum

【讨论】：

【解决方案3】：

;with cte as (
    SELECT
        a.DocEntry, joincounter = count(b.DocEntry)
    FROM
        OPCH P AS a 
        INNER JOIN PCH1 AS b ON a.DocEntry = b.DocEntry
    group by a.DocEntry
)
SELECT 
    case 
        when cte.joincounter > 1 then 0
        else cte.joincounter 
    end as joincounter

    ,P.DocNum
    , L.LineNum
    , P.DocCur
    , P.DocTotalFC
    , P.DocTotal
    , CASE 
        WHEN LEFT(L.AcctCode, 1) = '7'  THEN 'Admin'
        WHEN LEFT(L.AcctCode, 2) = '15' THEN 'Admin'
        WHEN L.AcctCode = '11501'       THEN 'MX'
        WHEN LEFT(L.Project, 1) = 'W'   THEN 'MX'
        WHEN L.OcrCode2 = '570'         THEN 'MEC'
        WHEN L.OcrCode2 = '590'         THEN 'ZHU'
        ELSE 'Flight Ops'
    END AS 'Type'
    , L.AcctCode AS 'Account'
    , L.OcrCode  AS 'Aircraft'
    , L.OcrCode2 AS 'Department'
    , L.OcrCode3 AS 'Business Unit'
    , L.Project  AS 'Project'               
    , L.LineTotal
FROM 
    OPCH P
    INNER JOIN PCH1 L ON P.DocEntry = L.DocEntry
    inner join cte on cte.DocEntry = P.DocEntry
WHERE
    P.DocDate >= '2016-01-01' 
    AND P.DocDate < '2016-03-31'  
ORDER BY
    P.DocNum, L.LineNum

【讨论】：