查詢父母和層次ID表的前兩名子女

我試圖從使用HiearchyID的單個表中獲取父母及其左上角和右上角的子女。幾個星期來，我一直在嘲笑我的頭腦，並希望得到任何幫助。查詢父母和層次ID表的前兩名子女

這是一張存儲學校辯論團隊「事實」的單一表格，每個事實都有孩子的事實，可以是「爲了」或「反對」父母的事實。我希望獲得父母和最近的「最近」「反對」事實的摘要頁面。相反，我得到了這些組合的交叉聯盟。

這裏是我的表：

factID (key) nodeID (hierarchyID) nodeLevel(computed column) text      side(1=for, 2=against) timestamp 
=======   ======     =========     ====      =====      ========= 
1    /1/2/      2       "Kirk rules"    1       08:00 
3    /1/2/1/     3       "Great actor!"    1       08:01 
5    /1/2/2/     3       "Picard is better."   2       08:02 
7    /1/2/3/     3       "best captain ever"   1       08:03 
32    /1/2/4/     3       "hate his over-acting"  2       08:04 
43    /1/2/5/     3       "PriceLine is great."  1       08:05 
44    /1/2/6/     3       "Spock was better too."  2       08:06

這裏是我當前的查詢：

SELECT P.text AS parentText, P.timeStamp AS parentTimeStamp, 
      L.text AS leftText, MAX(L.timeStamp) AS leftTimeStamp, 
      R.text AS rightText, MAX(R.timeStamp) AS rightTimeStamp 

FROM app.Facts AS P 
    LEFT OUTER JOIN app.Facts AS L 
      ON (P.nodeID = (L.nodeID).GetAncestor(1)) AND (L.sideID = 1 OR L.sideID IS NULL) 

    LEFT OUTER JOIN app.Facts AS R 
     ON (P.nodeID = (R.nodeID).GetAncestor(1)) AND (R.sideID = 2 OR R.sideID IS NULL) 

WHERE (P.text IS NOT NULL) AND (P.nodeLevel = 2)  

GROUP BY P.text, P.timeStamp, L.text, L.timeStamp, R.text, R.timeStamp 
HAVING L.timeStamp = MAX(L.timeStamp) AND R.timeStamp = MAX(R.timeStamp) 
ORDER BY P.timeStamp DESC, L.timeStamp DESC, R.timeStamp DESC

這是我想獲得什麼：

parentText  parentTimeStamp leftText     leftTimeStamp rightText    rightTimeStamp 
==========  =============== ===================== ============= =========    ============== 
"Kirk rules" 08:00   "PriceLine is great." 08:05   "Spock was better too." 08:06 
... 
"top fact xx" 11:00   'for' fact xx   11:01   'against' fact xx  11:01

這裏就是我得到：

parentText parentTimeStamp leftText    leftTimeStamp rightText    rightTimeStamp 
========== =============== ===================== ============= =========    ============== 
"Kirk rules" 08:00  "PriceLine is great." 08:05   "Spock was better too." 08:06 
"Kirk rules" 08:00  "PriceLine is great." 08:05   "hate his over-acting" 08:04 
"Kirk rules" 08:00  "PriceLine is great." 08:05   "Picard is better."  08:02 
"Kirk rules" 08:00  "best captain ever"  08:03   "Spock was better too." 08:06 
"Kirk rules" 08:00  "best captain ever"  08:03   "hate his over-acting" 08:04 
"Kirk rules" 08:00  "best captain ever"  08:03   "Picard is better."  08:02 
"Kirk rules" 08:00  "Great actor!"   08:01   "Spock was better too." 08:06 
"Kirk rules" 08:00  "Great actor!"   08:01   "hate his over-acting" 08:04 
"Kirk rules" 08:00  "Great actor!"   08:01   "Picard is better."  08:02 
... 
same thing with rest of the top level facts.

注：

TOP（1）將如果只有一個家長的工作，但我真正的表有很多頂級的父母。
根本事實總是等級2，前兩個樹層次基本上只是佔位符。
我使用T-SQL的SQL Server 2014上

真的很感激任何提示或解決方案！

來源

2015-07-05 Jason

我發現周圍的工作，加入兩列：

isLatestForArg  BIT NOT NULL, 
isLatestAgainstArg BIT NOT NULL

然後改變了我的查詢：

SELECT P.text AS parentText, P.timeStamp AS parentTimeStamp, 
     L.text AS leftText, MAX(L.timeStamp) AS leftTimeStamp, 
     R.text AS rightText, MAX(R.timeStamp) AS rightTimeStamp 

FROM app.Facts AS P 
LEFT OUTER JOIN app.Facts AS L 
     ON (P.nodeID = (L.nodeID).GetAncestor(1)) AND ((L.sideID IS NULL) OR (L.isLatestForArg = 1)) 

LEFT OUTER JOIN app.Facts AS R 
    ON (P.nodeID = (R.nodeID).GetAncestor(1)) AND ((R.sideID IS NULL) OR (R.isLatestAgainstArg = 1))

顯然不是理想的，因爲現在每一個INSERT需要更新isLatestFor /禁止標誌。

來源

2015-07-17 13:29:17 Jason

查詢父母和層次ID表的前兩名子女

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