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Ñòàòèñòèêà LiveInternet.ru: ïîêàçàíî êîëè÷åñòâî õèòîâ è ïîñåòèòåëåé
Ñîçäàí: 16.03.2006
Çàïèñåé:
Êîììåíòàðèåâ:
Íàïèñàíî: 4


Çàïðîñ LEFT JOIN ñ ïðèìåíåíèåì ñòàòèñòè÷åñêèõ âûðàæåíèé

Ïÿòíèöà, 18 Àâãóñòà 2017 ã. 13:38 + â öèòàòíèê
Äîáðûé äåíü!

 ðàìêàõ îäíîé ÁÄ èìååòñÿ äâå òàáëèöû (ïðîâåðêè è îøèáêè).

TableA (TableA.ID, TableA.Datechecks, TableA.CheckedFIO, TableA.CheckTypes)
TableB (TableB.ID, TableB.IDA, TableB.Mistake, TableB.MistakeCriticality)

Íåîáõîäèìî ïîäãîòîâèòü çàïðîñ, êîòîðûé áû îòîáðàæàë ñëåäóþùèå äàííûå:
ÔÈÎ, Êîë-âî ïðîâåðîê, Îáùåå êîë-âî îøèáîê, Êîë-âî îøèáîê_Îøèáêà, Êîë-âî îøèáîê_Ãð.îøèáêà, Êîë-âî ïðîâåðîê áåç îøèáîê, êîë-âî ïðîâåðîê áåç ãðóáûõ îøèáîê.

Ïîäîáíûé çàïðîñ ñìîã ðåàëèçîâàòü òîëüêî áåç ãðóïïèðîâêè ïî ÔÈÎ, âîò ÷òî ïîëó÷èëîñü (óâåðåí, ÷òî ìîæíî áûëî áû åùå ïðîùå íàïèñàòü):

àâòîð
SELECT (SELECT COUNT(*)
FROM (SELECT DISTINCT TableA.ID FROM TableA LEFT JOIN TableB ON TableA.ID = TableB.IDA)) AS Ïðîâåðêè,
COUNT(TableB.ID) AS Îøèáêè,
SUM(IIf(TableB.MistakeCriticality='Ãðóáàÿ îøèáêà',1,0)) AS Îøèáêè_ÃÐÓÁÀß,
SUM(IIf(TableB.MistakeCriticality='Îøèáêà',1,0)) AS Îøèáêè_ÎØÈÁÊÀ,
(SELECT COUNT(*) FROM (SELECT DISTINCT TableA.ID
FROM TableA
LEFT JOIN TableB
ON TableA.ID = TableB.IDA WHERE TableB.IDA IS NULL)) AS Ïðîâåðêè_áåç_îøèáîê,
(Ïðîâåðêè-(SELECT COUNT(*) FROM (SELECT DISTINCT TableA.ID
FROM TableA
LEFT JOIN TableB ON TableA.ID = TableB.IDA
WHERE TableB.MistakeCriticality = 'Ãðóáàÿ îøèáêà'))) AS Ïðîâåðêè_áåç_Ãðóáûõ_îøèáîê
FROM TableA LEFT JOIN TableB ON TableA.ID = TableB.IDA


Ïðè ïîïûòêå äîáàâèòü ãðóïïèðîâêó ïî ÔÈÎ, ò.å. äîáàâëÿþ ïîëå TableA.CheckedFIO è â êîíöå ïèøó GROUP BY TableA.CheckedFIO, âûäàåò àêòóàëüíûå äàííûå òîëüêî ïî "Îøèáêè", "Îøèáêè_ÃÐÓÁÀß", "Îøèáêè_ÎØÈÁÊÀ", âñå îñòàëüíûå äàííûå èìåþò îäèíàêîâîå çíà÷åíèå, ò.å. ñóììó, áåç ðàçáèâêè ïî êîíêðåòíûì ÔÈÎ.

Ïîæàëóéñòà, ïîìîãèòå ñîñòàâèòü êîððåêòíûé çàïðîñ, ÷òîáû âñå çíà÷åíèÿ â äàííûõ îòîáðàæàëèñü ñ ó÷åòîì ãðóïïèðîâêè ïî ÔÈÎ.

Çàðàíåå ñïàñèáî!

PS: Ïðèêðåïèë òåñòîâóþ ÁÄ ñ êàðòèíêîé òàáëè÷êè, ðåçóëüòàòû êîòîðûå äîëæíû áûòü.

http://www.sql.ru/forum/1269261/zapros-left-join-s-primeneniem-statisticheskih-vyrazheniy


 

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