add batch
remove batch
split batch
comment selection
show hidden batches
hide batch
highlight batch
db<>fiddle
Db2
Firebird
MariaDB
MySQL
Node.js
Oracle
Postgres
SQLite
SQL Server
TimescaleDB
YugabyteDB
Developer-C 11.1
3.0
4.0
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
5.5
5.6
5.7
8.0
18
11g Release 2
18c
21c
23c
8.4
9.3
9.4
9.5
9.6
10
11
12
13
14
15
16
3.8
3.16
3.27
3.39
2012
2014
2016
2017
2017 (Linux)
2019
2019 (Linux)
2022
2.11
2.6
2.8
2.18
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
Sakila
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
no sample DB
AdventureWorks
no sample DB
no sample DB
AdventureWorks
no sample DB
no sample DB
no sample DB
no sample DB
run
markdown
donate
feedback
about
By using db<>fiddle, you agree to license everything you submit by
Creative Commons CC0
.
declare @Source TABLE ( UserID tinyInt ,LessonID tinyInt ,DateStarted DATETIME2(0) ,DateEnded DATETIME2(0) ) Insert into @Source(UserID,LessonID,DateStarted,DateEnded) values(1,4,'20180606 09:00:00','20180606 11:00:00') ,(1,4,'20180606 10:00:00','20180606 11:30:00') --,(1,4,'20180606 11:30:00','20180606 12:00:00') --,(1,4,'20180606 14:30:00','20180606 15:00:00') ,(1,4,'20180607 10:00:00','20180607 10:30:00') ;WITH ctePrevious AS ( SELECT * ,LAG(DateEnded,1,NULL) OVER(PARTITION BY UserID,LessonID ORDER BY DateStarted) as prevDateEnd FROM @Source ) ,cteGrp AS ( SELECT * , CASE WHEN prevDateEnd >= DateStarted AND prevDateEnd < DateEnded THEN 0 ELSE 1 END as grp FROM ctePrevious ) ,cteSum AS ( SELECT * , SUM(grp) OVER(PARTITION BY UserID,LessonID ORDER BY DateStarted ROWS UNBOUNDED PRECEDING) as sumGrp FROM cteGrp ) ,cteMinMax AS ( SELECT UserID,LessonID ,min(DateStarted) as startDate ,max(DateEnded) as endDate FROM cteSum GROUP BY UserID,LessonID,sumGrp ) SELECT UserID,LessonID ,SUM(DATEDIFF(minute,startDate,endDate)) As TotalMinutes FROM cteMinMax GROUP BY UserID,LessonID
UserID
LessonID
TotalMinutes
1
4
180