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我有一個表(SoilSheet):查找列列訪問
ID | FieldID | SAMP_NUM | LINE_NUM | Year
的LINE_NUM列是1和25之間,我需要找到具有LINE_NUM行返回不同的SAMP_NUM和FieldID行的值他們在一排。
在SQL Server中,我能做到這一點(縮短到只返回第5個LINE_NUM列和它的作品幾乎瞬間:
SELECT DISTINCT S1.L1, S2.L2, S3.L3, S4.L4, S5.L5,
S.FieldID, S.SAMP_NUM FROM SoilSheet S
LEFT OUTER JOIN
(SELECT SAMP_NUM, FieldID, LINE_NUM AS L1
FROM SoilSheet WHERE YEAR = 2013 AND LINE_NUM = 1) S1
ON S1.SAMP_NUM = S.SAMP_NUM AND S1.FieldID = S.FieldID
LEFT OUTER JOIN
(SELECT SAMP_NUM, FieldID, LINE_NUM AS L2
FROM SoilSheet WHERE YEAR = 2013 AND LINE_NUM = 2) S2
ON S2.SAMP_NUM = S.SAMP_NUM AND S2.FieldID = S.FieldID
LEFT OUTER JOIN
(SELECT SAMP_NUM, FieldID, LINE_NUM AS L3
FROM SoilSheet WHERE YEAR = 2013 AND LINE_NUM = 3) S3
ON S3.SAMP_NUM = S.SAMP_NUM AND S3.FieldID = S.FieldID
LEFT OUTER JOIN
(SELECT SAMP_NUM, FieldID, LINE_NUM AS L4
FROM SoilSheet WHERE YEAR = 2013 AND LINE_NUM = 4) S4
ON S4.SAMP_NUM = S.SAMP_NUM AND S4.FieldID = S.FieldID
LEFT OUTER JOIN
(SELECT SAMP_NUM, FieldID, LINE_NUM AS L5
FROM SoilSheet WHERE YEAR = 2013 AND LINE_NUM = 5) S5
ON S5.SAMP_NUM = S.SAMP_NUM AND S5.FieldID = S.FieldID
LEFT OUTER JOIN
(SELECT SAMP_NUM, FieldID, LINE_NUM AS L10
FROM SoilSheet WHERE YEAR = 2013 AND LINE_NUM = 10) S10
ON S10.SAMP_NUM = S.SAMP_NUM AND S10.FieldID = S.FieldID
WHERE Year = 2013 AND
(SELECT ID FROM Fields WHERE ID=S.FieldID) IS NOT NULL
ORDER BY S.SAMP_NUM, S.FieldID
,我得到這個
L1 | L2 | L3 | L4 | L5 | FieldID | SAMP_NUM
1 | NULL | NULL | NULL | NULL | 289508 | 4416
1 | NULL | NULL | NULL | NULL | 291501 | 4417
NULL | NULL | 3 | NULL | NULL | 291339 | 4418
NULL | 2 | NULL | NULL | NULL | 291390 | 4418
1 | NULL | NULL | NULL | NULL | 291535 | 4418
1 | 2 | 3 | NULL | NULL | 287808 | 4470
NULL | NULL | NULL | 4 | 5 | 287811 | 4470
然而,轉換時到MS Access,這需要永遠。我也嘗試了下面這是在SQL Server很慢:
SELECT DISTINCT
(SELECT LINE_NUM FROM SoilSheet WHERE LINE_NUM = 1 AND Year = 2013
AND FieldID = S.FieldID AND SAMP_NUM = S.SAMP_NUM) AS L1,
(SELECT LINE_NUM FROM SoilSheet WHERE LINE_NUM = 2 AND Year = 2013
AND FieldID = S.FieldID AND SAMP_NUM = S.SAMP_NUM) AS L2,
(SELECT LINE_NUM FROM SoilSheet WHERE LINE_NUM = 3 AND Year = 2013
AND FieldID = S.FieldID AND SAMP_NUM = S.SAMP_NUM) AS L3,
(SELECT LINE_NUM FROM SoilSheet WHERE LINE_NUM = 4 AND Year = 2013
AND FieldID = S.FieldID AND SAMP_NUM = S.SAMP_NUM) AS L4,
(SELECT LINE_NUM FROM SoilSheet WHERE LINE_NUM = 5 AND Year = 2013
AND FieldID = S.FieldID AND SAMP_NUM = S.SAMP_NUM) AS L5,
FieldID, SAMP_NUM FROM SoilSheet S
WHERE Year = 2013 AND (SELECT ID FROM Fields WHERE ID = S.FieldID)
IS NOT NULL ORDER BY S.SAMP_NUM, S.FieldID
,但也需要永遠在Access中。有沒有辦法在Access中執行此操作?
好吧,沒關係,我找到了一種方法來做到這一點: – 2015-03-31 00:57:23
你應該看看轉動命令在SQL Server自25外連接是不最有效的路線。我有一段時間沒有使用過Access,但我相信TRANSFORM是相當的。 – ElPresidente 2015-03-31 01:05:21
你可以回答你自己的問題,讓其他人知道 – sqluser 2015-03-31 02:22:43