複数の日付フィールドをグループ化するSQLクエリ

Question

複数の日付フィールドを持つテーブルがあります。たとえば、defectテーブルには、dateAssigned、dateCompleted、dateResolvedというものがあります。私は、次のような欠点をまとめたクエリを取得しようとしています：

  | Number Assigned | Number Completed | Number Resolved 
-----------------------------+------------------+----------------- 
    Mar-2011 |  33   |  22  |  33   
    Apr-2011 |  10   |  11  |  22 
    May-2011 |  22   |  66  |  46 

など

私は無駄に以下が出ている：

SELECT year(d.dateAssigned) 
     ,month(d.dateAssigned) 
     ,COUNT(d.dateAssigned) 
     ,COUNT(d.dateCompleted) 
     ,COUNT(d.dateResolved) 
    FROM defect d 
    GROUP BY year(d.dateAssigned), month(d.dateAssigned) 
    ORDER BY year(d.dateAssigned), month(d.dateAssigned) 

これは、要約のために正しく動作しますdateAssignedの欠陥は、他の欠陥はない。これはおそらく私がdateAssignedでグループ化しているという事実によると分かっていますが、それ以外の方法はわかりません。

ご協力いただければ幸いです。

Answer 1

これはこれを行う1つの方法です。

SELECT YEAR(typedate), 
     MONTH(typedate), 
     SUM(CASE 
      WHEN TYPE = 'assinged' THEN 1 
      ELSE 0 
      END) number_assigned, 
     SUM(CASE 
      WHEN TYPE = 'completed' THEN 1 
      ELSE 0 
      END) number_completed, 
     SUM(CASE 
      WHEN TYPE = 'Resolved' THEN 1 
      ELSE 0 
      END) number_resolved 
FROM (SELECT dateassigned typedate, 
       'assinged' AS TYPE 
     FROM sampledata 
     WHERE dateassigned IS NOT NULL 
     UNION ALL 
     SELECT datecompleted typedate, 
       'completed' AS TYPE 
     FROM sampledata 
     WHERE datecompleted IS NOT NULL 
     UNION ALL 
     SELECT dateresolved typedate, 
       'Resolved' AS TYPE 
     FROM sampledata 
     WHERE dateresolved IS NOT NULL) data 
GROUP BY YEAR(typedate), 
      MONTH(typedate) 
ORDER BY YEAR(typedate), 
      MONTH(typedate) 

サブ選択は、2つの列がtypedateとその後、私はデータをピボットするSUM(CASE...を使用し、この

typedate type 
-------- --------- 
1/1/2011 assinged 
1/1/2011 assinged 
1/1/2011 assinged 
2/1/2011 completed 
2/1/2011 completed 
2/3/2011 Resolved 

のようになります。

を入力し作成します。あなたがそれをサポートしているRDBMSを使用している場合は、pivotを使用することができ、最終的な出力はこの

     Number_Assigned Number_completed Number_Resolved 
----------- ----------- --------------- ---------------- --------------- 
2011  1   3    0    0 
2011  2   0    2    1 

ようになり代わり

私は年と月の書式設定を行うためにあなたにそれを残しておきます

Answer 2

もう1つの方法は、フィールドをオンザフライまたはテンポラリテーブルまたはパーマネントテーブルとしてテーブルmonthsを作成することです（100年および100x12の行を格納したテーブルでは、他のクエリでは便利です）、このようなものを使用してください（これはmonthsテーブルdefectからLEFT JOIN編3回）：

SELECT 
    (SELECT COUNT(*) 
     FROM defect AS d 
     WHERE m.firstDate <= d.dateAssigned 
     AND d.dateAssigned < m.nextMonthFirstDate 
    ) AS Number_Assigned 
    . (SELECT COUNT(*) 
     FROM defect AS d 
     WHERE m.firstDate <= d.dateCompleted 
     AND d.dateCompleted < m.nextMonthFirstDate 
    ) AS Number_Completed 
    . (SELECT COUNT(*) 
     FROM defect AS d 
     WHERE m.firstDate <= d.dateResolved 
     AND d.dateResolved < m.nextMonthFirstDate 
    ) AS Number_Resolved 
FROM months AS m 
ORDER BY m.year 
     , m.month 

Answer 3

SELECT year(defectDate), month(defectDate), SUM(assigned), SUM(resolved), SUM(completed) 
    FROM (
    SELECT d.dateAssigned AS defectDate, 1 AS assigned, 0 AS resolved, 0 AS completed 
     FROM defect d 
    UNION ALL 
    SELECT d.dateCompleted AS defectDate, 0 AS assigned, 1 AS resolved, 0 AS completed 
     FROM defect d 
    UNION ALL 
    SELECT d.dateResolved AS defectDate, 0 AS assigned, 0 AS resolved, 1 AS completed 
     FROM defect d 
) 
    GROUP BY year(defectDate), month(defectDate) 
    ORDER BY year(defectDate), month(defectDate) 

Answer 4

SELECT year(d.dateAssigned) 
     ,month(d.dateAssigned) 
     ,COUNT(d.dateAssigned) 
     ,(SELECT count(*) 
     FROM defect as dc 
     WHERE month(dc.dateCompleted) = month(d.dateAssigned) and 
       year(dc.dateCompleted) = year(d.dateAssigned)) 
     ,(SELECT count(*) 
     FROM defect as dr 
     WHERE month(dr.dateResolved) = month(d.dateAssigned) and 
       year(dr.dateResolved) = year(d.dateAssigned)) 
FROM defect d 
GROUP BY year(d.dateAssigned), month(d.dateAssigned) 

Answer 5

これは、我々が

SELECT CASE 
     WHEN (year(Challan_Date) is null or year(TAX_INVOICE_Date)!=null) THEN year(TAX_INVOICE_Date) 
     WHEN (year(Challan_Date) != null or year(TAX_INVOICE_Date) is null) THEN YEAR(Challan_Date) 
     WHEN (year(Challan_Date) is null or year(TAX_INVOICE_Date)is null) THEN 'NA' 
     WHEN (year(Challan_Date) != null or year(TAX_INVOICE_Date)!= null) THEN year(Challan_Date) 
     ELSE year(TAX_INVOICE_Date) END as Dates_Record, TAX_INVOICE_Date, Challan_Date 
FROM TransactionRecords