我正在为似乎是我写过的最复杂的 SQL 查询而苦苦挣扎!
数据库结构:
frog_shared.staff
`ID`, `Firstname`, `Surname`
frog_observations.observations
`ID`, `Teacher_ID`, `Type`, `Main_Positive_Aspect`, `Main_Development_Aspect`, `Grade_for_Behaviour`, `Grade_for_Attainment`, `Grade_for_Teaching`
frog_observations.aspects
`ID`, `Observation_ID`, `Label_ID`, `Type`
frog_observations.aspect_labels
`ID`, `Title`
样本数据:
Member of staff:
`12345`, `Duncan`, `Wraight`
Observation:
`9888`, `12345`, `Formal`, `5`, `7`, `1`, `1`, `1`
Aspects:
`101`, `9888`, `2`, `P`
Aspect labels:
`2`, `Questioning`
我想要达到的目标:
我想列出一份我们在特定观察方面最好的老师的名单。例如,我想看看我的前 5 位老师的“提问”。
最重要的是,我想对数据进行一些过滤:
- 正式(
Type=Formal
)和分享最佳实践(Type=SBP
)观察的各个方面都应该被计算在内 - 仅当该观察的评分最多为 2 分(不高于,即不能有两个评分为 2 分,一个评分为 3 分)但共享最佳实践观察的评分均为 0 时,才应计算来自正式观察的方面
- 记录在观察表中的主要积极方面应在计数中加权
- 对于正式观察,主要积极方面的权重应为正常方面的 3*
- 为了分享最佳实践观察,主要积极方面的权重应为正常方面的 2*
我的尝试:
此声明按等级过滤观察结果,但不包括任何主要的积极方面(它们不包括在原始系统中)
SELECT
CONCAT(s.Firstname, " ", s.Surname) AS `Teacher`,
COUNT( * ) AS Total,
GREATEST(o.`Achievement_Grade`, o.`Behaviour_Grade`, o.`Teaching_Grade`) AS `Worst Grade`
FROM frog_observations.observations o
INNER JOIN frog_shared.staff s ON o.Teacher_ID = s.ID
INNER JOIN frog_observations.aspects a ON o.ID = a.Observation_ID
WHERE a.Aspect_ID = 4
AND ( GREATEST(o.`Achievement_Grade`, o.`Behaviour_Grade`, o.`Teaching_Grade`) BETWEEN 1 AND 2 ) AND o.Datetime > '2011-09-01'
AND a.Type = 'P'
GROUP BY s.ID
ORDER BY `Total` DESC
LIMIT 5
现在我想做的方式是这样的:
SELECT
CONCAT(s.Firstname, " ", s.Surname) AS `Teacher`,
COUNT(mp.*) AS `Number of Appraisal Main Positives`,
COUNT(sp.*) AS `Number of SBP Main Positives`,
COUNT(a.*) AS `Number of Other Positives`,
SUM(`Number of Appraisal Main Positives` + `Number of SBP Main Positives` `Number of Other Positives`) AS `Total`
FROM
`frog_observations`.`observations` o,
( `frog_observations`.`observations` WHERE `Type` = 'Formal') AS mp,
( `frog_observations`.`observations` WHERE `Type` = 'SBP') AS sp
INNER JOIN
`frog_observations`.`aspects` a ON a.Observation_ID = o.ID
GROUP BY s.ID
不幸的是,除了知道我想要的标题(即number of appraisal main positives
、number of sharing best practice positives
和number of standard positives
a weighted total
)之外,我不知道如何编写我认为将是子查询的内容,以便从单个语句中获取所有这些信息。
任何指导表示赞赏。
编辑:示例输入/输出
输入
用户想要查看方面的前 5 名员工Questioning
流程
- 方面在表中Questioning
有 ID 。- 然后,系统应为每位员工计算他们拥有的人数,并设置为。其中一些观察将是正式的,而一些将是SBP。- 系统还应计算表中每个员工所在的行数。4
aspect_labels
observations
Main_Positive_Aspect
4
Type
Type
aspects
Aspect_ID
4
输出
钥匙:
- FMP = Formal
observations
表中的行数;; 和是(即在表中)Type
GREATEST(Achievement_Grade, Behaviour_Grade, Teaching_Grade) BETWEEN 1 AND 2
Main_Positive_Aspect
4
Questioning
aspects_label
- SMP =
observations
表中Type
SBP 和Main_Positive_Aspect
is的行数4
- 其他=
aspects
表中Aspect_ID
每个4
员工的行数(通过o.Observation_ID
->o.Staff_ID
链接) - 点数= 每项的加权总和 - 每个 FMP 值 3 分,每个 SMP 值 2 分,每个 Other 值 1。然后应
DESC
按此列对查询进行排序。
示例输出:
-------------------------------------------------------------
| Staff Name FMP SMP Other Points |
|------------------------------------------------------------
| D Wraight 2 1 4 12 |
| A Nother 3 0 0 9 |
| J Bloggs 0 4 1 9 |
| J Arthur 1 1 1 6 |
| M Turner 0 1 0 2 |
-------------------------------------------------------------
以下是单独编写的查询,它们适用于我的数据库。基本上我需要将这些合并到一个查询中。如果可以的话!
#=======#
# FMP #
#=======#
SELECT
CONCAT(s.Firstname, " ", s.Surname) AS `Teacher`,
COUNT( * ) AS `FMP`
FROM frog_observations.observations o
INNER JOIN frog_shared.staff s ON o.Teacher_ID = s.ID
WHERE o.Main_Positive = 4
AND o.Type = 'F'
AND ( GREATEST(o.`Achievement_Grade`, o.`Behaviour_Grade`, o.`Teaching_Grade`) BETWEEN 1 AND 2 )
GROUP BY s.ID
#=======#
# SMP #
#=======#
SELECT
CONCAT(s.Firstname, " ", s.Surname) AS `Teacher`,
COUNT( * ) AS `SMP`
FROM frog_observations.observations o
INNER JOIN frog_shared.staff s ON o.Teacher_ID = s.ID
WHERE o.Main_Positive = 4
AND o.Type = 'S'
GROUP BY s.ID
#=========#
# Other #
#=========#
SELECT
CONCAT(s.Firstname, " ", s.Surname) AS `Teacher`,
COUNT( * ) AS `Other`
FROM observations o
INNER JOIN frog_shared.staff s ON o.Teacher_ID = s.ID
INNER JOIN aspects a ON o.ID = a.Observation_ID
WHERE a.Aspect_ID = 4
AND a.Type = 'P'
GROUP BY s.ID