我需要显示“Scheduled vs Actual”报告,该报告显示
MySQL数据库中两个表之间的差异,这两个表保持学校的出勤率.
我有两张名为Booking and Attendance的表.
存储在表格中的数据如下:
预订
Id Student Date IsAbsent
1 John 20160216 1 //NO
2 Bob 20160217 1 //NO
3 Zara 20160218 1 //NO
勤
Id Student Date IsAbsent
1 John 20160216 0 //YES
2 Bob 20160217 0 //YES
3 Mary 20160217 1 //NO
基本上我想把输出显示为
**Id | Student | Day_1 | Day_2 | Day_3**
==== ========= ====== ======= ======
1 | John |ABSENT | NULL | NULL
2 | Bob |NULL |ABSENT | NULL
3 | Mary |NULL |NEW | NULL
4 | Zara |DELETED|NULL | NULL
预订表中的约翰逊被标记为1(错误)但在考勤表中他被标记为0(是)所以我想显示为’缺席’
新Mary只在考勤表中输入,但不在预订表中.
删除Zara最初预订并在预订表中,但不在出勤表中.
我创建了SQL Fiddle架构和我正在使用的查询,但它总是返回空值.
我的SQL查询如下所示..
SELECT * FROM
((SELECT
a.Student as student,
MAX( case
when a.DropDate='20160216' && a.IsAbsent=0 && s.IsAbsent=1 then 'Absent'
when (select count(*) from attendance where DropDate='20160216')=0 && (select count(*) from staging where DropDate='20160216')>0 then 'DELETED Booking'
when (select count(*) from attendance where DropDate='20160216')>0 && (select count(*) from staging where DropDate='20160216')=0 then 'New Booking'
else ' ' end ) as 'day_1',
MAX( case
when a.DropDate='20160217' && a.IsAbsent=0 && s.IsAbsent=1 then 'Absent'
when (select count(*) from attendance where DropDate='20160217')=0 && (select count(*) from staging where DropDate='20160217')>0 then 'DELETED Booking'
when (select count(*) from attendance where DropDate='20160217')>0 && (select count(*) from staging where DropDate='20160217')=0 then 'New Booking'
else ' ' end ) as 'day_2',
MAX( case
when a.DropDate='20160218' && a.IsAbsent=0 && s.IsAbsent=1 then 'Absent'
when (select count(*) from attendance where DropDate='20160218')=0 && (select count(*) from staging where DropDate='20160218')>0 then 'DELETED Booking'
when (select count(*) from attendance where DropDate='20160218')>0 && (select count(*) from staging where DropDate='20160218')=0 then 'DELETED Booking'
else ' ' end ) as 'day_3'
FROM Attendance a LEFT JOIN Booking s on a.Student=s.Student
WHERE a.DropDate IN ('20160216','20160217','20160218')
AND NOT EXISTS
( SELECT 1
FROM Booking AS p
WHERE p.Student = a.Student
AND p.IsAbsent = a.IsAbsent
AND p.DropDate = a.DropDate
)
)
UNION
(SELECT
t.Student as student,
MAX( case
when t.DropDate='20160216' && a.IsAbsent=0 && t.IsAbsent=1 then 'Absent'
when (select count(*) from attendance where DropDate='20160216')=0 && (select count(*) from staging where DropDate='20160216')>0 then 'DELETED Booking'
when (select count(*) from attendance where DropDate='20160216')>0 && (select count(*) from staging where DropDate='20160216')=0 then 'New Booking'
else ' ' end ) as 'day_1',
MAX( case
when a.DropDate='20160217' && a.IsAbsent=0 && t.IsAbsent=1 then 'Absent'
when (select count(*) from attendance where DropDate='20160217')=0 && (select count(*) from staging where DropDate='20160217')>0 then 'DELETED Booking'
when (select count(*) from attendance where DropDate='20160217')>0 && (select count(*) from staging where DropDate='20160217')=0 then 'New Booking'
else ' ' end ) as 'day_2',
MAX( case
when a.DropDate='20160218' && a.IsAbsent=0 && t.IsAbsent=1 then 'Absent'
when (select count(*) from attendance where DropDate='20160218')=0 && (select count(*) from staging where DropDate='20160218')>0 then 'DELETED Booking'
when (select count(*) from attendance where DropDate='20160218')>0 && (select count(*) from staging where DropDate='20160218')=0 then 'DELETED Booking'
else ' ' end ) as 'day_3'
FROM Booking t LEFT JOIN attendance a on t.Student=a.Student
WHERE t.DropDate IN ('20160216','20160217','20160218')
AND NOT EXISTS
( SELECT 1
FROM Attendance AS u
WHERE u.Student = t.Student
AND u.IsAbsent = t.IsAbsent
AND u.DropDate = t.DropDate
)
)) tbl
ORDER BY student
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最佳答案 我不确定你可以在MySQL查询中输出内联布局,除非你做了一个程序……
我不知道这对你是否合适,因为它有一个略有不同的布局,但它的工作原理:
(select s.Student,
s.ClassRoom,
s.DropDate,
if(s.IsAbsent=1&&a.IsAbsent=0,'ABSENT','PRESENT')
from Staging s inner join Attendance a on a.Student = s.Student and a.ClassRoom = s.ClassRoom and a.DropDate = s.DropDate)
UNION ALL
(Select s.Student,
s.ClassRoom,
s.DropDate,
'DELETED'
from Staging s left join Attendance a on a.Student = s.Student and a.ClassRoom = s.ClassRoom and a.DropDate = s.DropDate
where a.Student is null)
UNION ALL
(Select a.Student,
a.ClassRoom,
a.DropDate,
'NEW'
from Staging s right join Attendance a on a.Student = s.Student and a.ClassRoom = s.ClassRoom and a.DropDate = s.DropDate
where s.Student is null)
order by Student, DropDate;