通过特定的表记录值进行迭代，以用于从另一个表中过滤查询

Question

有一个名为Tbl的临时表，它是根据查询创建的（可能与知道无关）可以在任何特定日期运行，但通常只是当前日期（CURDATE()），其中始终只有两个BatNum（批号）记录，其中最旧的TimeStr将是开始时间，最新的TimeStr将是每个BatNum的结束时间。

这些是我们开始的记录，所以这里没有问题，但这是我们从另一个表中获得的所有内容。虽然在我提供的这个小例子中有三组不同的BatNum记录（1,2,3），但可能只有1或最多可能有30。

Tbl表

Tbl解释

My SQL Fiddle

我在这里用SQL Fiddle表中的一小部分数据创建了一个Weight，为了防万一，我在Raw SQL部分中放了一些更大的数据样本。

这些只是按照特定范围记录的来自Weights表的数据的缩小样本，但对于给定批次（即，每个BatNum组），它可以是50,000,25,000等。

我的问题

我把这个逻辑放到一个存储过程中，如果对MySQL有任何意义的话。

我试图以某种方式从Tbl表中为每个TimeStr分组（总是两个）的两个BatNum值记录中的每一个，使用那些从Weight表获取记录，然后汇总该数据（每个分组）与各种功能等，无论需要什么记录。

我的想法（呃哦...... spaghettios）

我不确定我是否可以动态创建一个@StartTime和一个@EndTime变量，并从每个BatNum组TimeStr值迭代它们的值，然后在MySQL中使用另一个查询等。

例如，我可以运行这种类型的过滤（WHERE TimeStr BETWEEN @StartTime AND @EndTime）和每个BatNum组（例如三个）的查询，每个查询中的@StartTime和@EndTime值被设置为每个TimeStr组的BatNum值 - 但我可以使用MIN(TimeStr)，MAX(TimeStr)，或者ORDER BY TimeStr [ASC/DESC] LIMIT 1知道哪个是开始，哪个是相应的结束。

为了给你一个想法，从BatNum每个Tbl组迭代的值的例子是：

从BatNum = 1记录（迭代1）

SET @StartTime = '2017-12-14 06:12:31';

SET @EndTime = '2017-12-14 07:45:55';

SET @val = 15;

来自BatNum = 2条记录（迭代2）

SET @StartTime = '2017-12-14 07:45:56';

SET @EndTime = '2017-12-14 12:15:51';

SET @val = 12;

来自BatNum = 3条记录（迭代3）

SET @StartTime = '2017-12-14 12:15:52';

SET @EndTime = '2017-12-14 16:20:58';

SET @val = 15;

最后，例如，我可能需要使用类似的东西：

SELECT  @Val            oz
        , COUNT(Value)  count
        , AVG(Value)    average
        , STDDEV(Value) stddev
FROM Weights 
WHERE TimeStr BETWEEN @StartTime AND @EndTime;

我只是不确定如何最好地处理来自BatNum表的每个Tbl组的记录，所以我想我会请求一些帮助。

别忘了：

SQL Fiddle

原始SQL

CREATE TABLE `Tbl` (
  `BatNum` int NOT NULL,
  `TimeStr` datetime NOT NULL,
  `Value` float NOT NULL,
  KEY `idx_TimeStr` (`TimeStr`)
);

INSERT INTO `Tbl` (`BatNum`,`TimeStr`,`Value`) VALUES (1,'2017-12-14 06:12:31',15);
INSERT INTO `Tbl` (`BatNum`,`TimeStr`,`Value`) VALUES (1,'2017-12-14 07:45:55',15);
INSERT INTO `Tbl` (`BatNum`,`TimeStr`,`Value`) VALUES (2,'2017-12-14 07:45:56',12);
INSERT INTO `Tbl` (`BatNum`,`TimeStr`,`Value`) VALUES (2,'2017-12-14 12:15:51',12);
INSERT INTO `Tbl` (`BatNum`,`TimeStr`,`Value`) VALUES (3,'2017-12-14 12:15:52',15);
INSERT INTO `Tbl` (`BatNum`,`TimeStr`,`Value`) VALUES (3,'2017-12-14 16:20:58',15);

CREATE TABLE `Weights` (
  `TimeStr` datetime NOT NULL,
  `Value` float NOT NULL,
  KEY `idx_TimeStr` (`TimeStr`)
);

INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:12:31',431);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:12:44',431.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:12:51',430.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:12:59',431.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:13:08',430.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:13:14',431.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:13:20',431.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:13:26',431);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:13:40',431.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:13:47',430.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:17:58',442);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:17:59',461.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:17:59',367.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:00',361.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:00',381);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:01',382.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:01',380.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:02',370);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:03',432.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:03',466.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:04',397.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:04',439.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:04',459.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:05',430.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:05',385.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:06',380);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:06',386.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:07',395.3);
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INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:08',387.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:08',379.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:09',373.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:09',372.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:09',368.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:10',374.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:10',386.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:11',403.2);
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INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:13',403.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:13',389);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:14',423.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:14',412.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:15',407.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:15',386.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:16',421);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:16',367.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:16',375.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:17',373.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 06:18:17',376);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:49',377.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:49',443);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:48',439.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:47',439.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:46',0);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:46',453.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:45',453);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:45',447.5);
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INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:27',443.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 07:44:27',453);
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INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:06',395.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:06',410.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:07',440);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:07',426.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:08',471);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:08',384.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:09',469.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:09',433.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:09',440.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:10',472.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:11',425.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:11',473.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:12',386);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:12',384.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:13',443.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:13',434.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:13',457.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:14',417.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:14',422.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:15',464.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:16',475);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:16',427);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:17',445);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:18',456.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:18',459.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:19',441.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:19',483.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:20',411);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:20',489.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:21',453.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 12:23:21',474);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:58',426.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:57',446.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:57',396.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:57',483.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:56',419.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:56',427.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:55',407.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:55',402);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:54',435.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:54',406.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:53',421);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:53',437.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:53',432.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:52',400.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:52',426.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:51',472.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:51',419.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:50',447.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:50',420.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:50',428.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:49',463.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:49',453.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:42',457.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:42',461.1);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:41',461.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:20:40',456.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:47',455.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:44',453.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:43',456.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:42',457.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:42',450.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:41',446.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:41',443.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:40',448.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:40',445.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:39',441.8);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:39',439.3);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:38',435.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:38',433.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:37',433.5);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:37',434.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:36',430.7);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:36',425.6);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:36',425.4);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:35',426);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:35',422);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:34',421.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:34',420.9);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:33',420.2);
INSERT INTO `Weights` (`TimeStr`,`Value`) VALUES ('2017-12-14 16:14:33',422.4);

Answer 1

我认为您不需要存储过程，但您需要一个（或多个）视图或临时表，其中批量编号和重量（oz）与权重表中的权重相关联。完成后，您可以从该视图创建任何类型的聚合值。

以下是为您提供临时表的查询。

SELECT p.`Value`, q.BatNum, q.Value oz
FROM `weights` p
LEFT JOIN 
  (SELECT a.BatNum BatNum, a.TimeStr sTime, b.TimeStr eTime, a.value Value
   FROM Tbl a
   LEFT JOIN Tbl b ON (a.BatNum = b.BatNum)
   WHERE a.TimeStr < b.TimeStr) q 
  ON (p.`TimeStr` BETWEEN q.sTime and q.eTime)

这应该给你一个如下输出：

Value     BatNum    oz
431       1         15
431.2     1         15
...  
....
352.8     2         12
352.4     2         12
......
.....
427.3     3         15
427.1     3         15
.....
.....

从上面的表或视图中，您可以创建最终查询，例如

SELECT oz, count(value), avg(value)
FROM createdView
GROUP BY BatNum

如果您使用的是mysql，那么创建视图比直接从此处复制查询需要更多的努力。在从大数据生成更快结果的情况下，您可能还需要优化查询。

通过特定的表记录值进行迭代，以用于从另一个表中过滤查询

问题描述投票：1回答：1

Tbl表

Tbl解释

My SQL Fiddle

我的问题

原始SQL

1个回答

最新问题

通过特定的表记录值进行迭代，以用于从另一个表中过滤查询

问题描述 投票：1回答：1

Tbl表

Tbl解释

My SQL Fiddle

我的问题

原始SQL

1个回答

最新问题

问题描述投票：1回答：1