查找列列访问

我有一个表（SoilSheet）：查找列列访问

ID | FieldID | SAMP_NUM | LINE_NUM | Year

的LINE_NUM列是1和25之间，我需要找到具有LINE_NUM行返回不同的SAMP_NUM和FieldID行的值他们在一排。

在SQL Server中，我能做到这一点（缩短到只返回第5个LINE_NUM列和它的作品几乎瞬间：

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

，我得到这个

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，转换时到MS Access，这需要永远。我也尝试了下面这是在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

，但也需要永远在Access中。有没有办法在Access中执行此操作？

来源

2015-03-31 Joe Oliphant

好吧，没关系，我找到了一种方法来做到这一点： – 2015-03-31 00:57:23

你应该看看转动命令在SQL Server自25外连接是不最有效的路线。我有一段时间没有使用过Access，但我相信TRANSFORM是相当的。 – ElPresidente 2015-03-31 01:05:21

你可以回答你自己的问题，让其他人知道 – sqluser 2015-03-31 02:22:43

我找到了一种方法来做到这一点：

TRANSFORM LINE_NUM AS L 
SELECT SAMP_NUM, FieldID FROM SoilSheet WHERE Year = 2013 
GROUP BY SAMP_NUM, FieldID 
PIVOT LINE_NUM

来源

2015-03-31 05:08:04

查找列列访问

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