具有多个条件的自我加入

Question

我正在使用mysql来存储化学分析。 并使用html / php过滤结果并生成查询以获取我想要的结果。 现在，事情对我来说变得越来越复杂，我正在尝试自行加入表格以应用所有过滤器。

我的表设计类似于具有超过5万行的表。

+--------+---------+-------------+----------------+
| Column |  Type   |    Index    |                |
+--------+---------+-------------+----------------+
| RID    | int     | primary_key | auto increment |
| ID     | int     | index       |                |
| Type   | int     |             |                |
| Order  | int     |             |                |
| Num    | int     |             |                |
| Val1   | decimal |             |                |
| Val2   | decimal |             |                |
+--------+---------+-------------+----------------+

每个样本都有一个ID ，不同的类型和顺序 。 Val1和Val2是Num类型分析的结果。 现在有42个不同的Num。

例如，如果我的过滤器是这样的，

Select Types (1,3,9)
Select ANum (0,5)
Type 1, Num 5 should be bigger than 10 In Val2
Type 1, Num 5, should be smaller than 30 In Val2
Type 3, Num 0, should be smaller than 8 In Val1

我正在使用该查询来产生结果。

SELECT analyse.* FROM analyse 
INNER JOIN 
(SELECT ID FROM analyse WHERE Type = 1 AND Num = 5 AND Val2 < 30) AS a1 ON a1.SID = analyse.SID 
INNER JOIN 
(SELECT SID FROM  WHERE Type = 1 AND Num = 5 AND Val2 > 10) AS a2 ON a2.SID = analyse.SID
INNER JOIN 
(SELECT SID FROM analyse WHERE Type = 3 AND Num = 0 AND Val1 > 8) AS a3 ON a2.SID = analyse.SID 
WHERE Type IN (1,3,9) AND Num IN (0,5) ORDER BY ID, Type, Order, Num ASC

+-----+------+-------+---------------+--------------+--------------+--------------+
| ID  | Type | Order | Val1[Num[0]]  | Val2[Num[0]] | Val1[Num[5]] | Val2[Num[5]] |
+-----+------+-------+---------------+--------------+--------------+--------------+
| ... | ...  | ...   | ...           | ...          | ...          | ...          |
| 118 | 1    | 1     | 10.9000       | 2.2083       | 3.5056       | 15.2627      |
| 118 | 1    | 2     | 9.5000        | 1.9246       | 2.0305       | 11.7049      |
| 118 | 1    | 3     | 7.9000        | 1.6005       | 2.4274       | 16.6597      |
| 118 | 2    | 1     | 10.9000       | 2.2083       | 3.5056       | 15.2627      |
| 118 | 3    | 2     | 20.4000       | 4.1329       | 2.8187       | 22.9676      |
| 118 | 4    | 3     | 28.3000       | 5.7334       | 2.7094       | 29.6273      |
| 119 | 1    | 1     | 27.2000       | 6.8635       | 0.5506       | 14.9084      |
| 119 | 1    | 2     | 25.9000       | 6.5355       | 0.4249       | 10.9550      |
| 119 | 3    | 1     | 27.2000       | 6.8635       | 0.5506       | 14.9084      |
| 119 | 3    | 2     | 53.1000       | 13.3989      | 0.4893       | 25.8634      |
| ... | ...  | ...   | ...           | ...          | ...          | ...          |
+-----+------+-------+---------------+--------------+--------------+--------------+

所需的输出应该是这样的。 但是，由于还有其他Val1和Val2值具有相同的ID，相同的Type但顺序不同，所以INNER JOIN不能按我预期的那样工作。 总是出现比我的过滤器更大或更小的值。 其中一些从未显示。

抱歉，如果太长。 我找不到正确的陈述或结构。 有什么建议吗？

编辑：对不起。 我忘了提及所有其他必须显示ID的数据。 这就是为什么我要使用join的原因。

Answer 1

因此，您在桌子上的要求是

Select Types (1,3,9)
Select Num (0,5)
Type 1, Num 5 should be bigger than 10 In Val2
Type 1, Num 5, should be smaller than 30 In Val2
Type 3, Num 0, should be smaller than 8 In Val1

基本上有4种不同的标准需要评估（类型，数字，Val1，Val2）

尽管可能存在“更好”的解决方案（就性能而言或更易于阅读的代码而言），但最简单的方法是创建不同的条件对，除非您处理数百万条记录，否则这应该很好。

出于您的要求，我认为您需要获取以下行集：

1.) Type = 1, Num = 5, Val2 > 10
2.) Type = 1, Num = 5, Val2 < 30
3.) Type = 3, Num = 0, Val1 < 8
4.) Type = 9

因此，这将是“ 4个显式”查询的并集：

SELECT * FROM analyse WHERE Type = 1 AND Num = 5 AND Val2 > 10
UNION
SELECT * FROM analyse WHERE Type = 1 AND Num = 5 AND Val2 < 10
UNION
SELECT * FROM analyse WHERE Type = 3 AND Num = 0 AND Val1 < 8
UNION
SELECT * FROM analyse WHERE Type = 9

要按ID过滤最终结果，您可以简单地使用：

SELECT * FROM (
  SELECT * FROM analyse WHERE Type = 1 AND Num = 5 AND Val2 > 10
  UNION
  SELECT * FROM analyse WHERE Type = 1 AND Num = 5 AND Val2 < 10
  UNION
  SELECT * FROM analyse WHERE Type = 3 AND Num = 0 AND Val1 < 8
  UNION
  SELECT * FROM analyse WHERE Type = 9
) as tempTable WHERE id = 118

• 或仅将ID附加到每个独立查询中。

Answer 2

我已经解决了我的问题，通过一起查询相同的Num和Type而不是通过单独的联接来获取它们。 这样，没有其他具有相同Num和Type的数据可以通过过滤器。

对于那种情况

Select Types (1,3,9)
Select ANum (0,5)
Type 1, Num 5 should be bigger than 10 In Val2
Type 1, Num 5, should be smaller than 30 In Val2
Type 3, Num 0, should be smaller than 8 In Val1

查询应该是这样，

SELECT analyse.* FROM analyse 
INNER JOIN 
(SELECT ID FROM analyse WHERE Type = 1 AND Num = 5 AND Val2 < 30 AND Val2 > 10) AS a1 ON a1.SID = analyse.SID 
(SELECT SID FROM analyse WHERE Type = 3 AND Num = 0 AND Val1 > 8) AS a3 ON a2.SID = analyse.SID 
WHERE Type IN (1,3,9) AND Num IN (0,5) ORDER BY ID, Type, Order, Num ASC