troubleshooting Question

Sql to show scheduling conflicts

Avatar of E43509
E43509Flag for United States of America asked on
Microsoft AccessSQL
9 Comments2 Solutions388 ViewsLast Modified:

Need some help coming up with a query to show scheduling conflicts for referees.
Basically I need to show games for referees in which the games overlap.
The tables give us the game start times & game length in minutes.
I've simplified the table structure in the attached mdb file

The query below shows the relationship between the tables.

SELECT Persons.PersonId, Persons.NameLast, Persons.NameFirst, Games.GameId, Games.GameNo, Games.GameStartDt, Divisions.GameLength, OfficialPositions.OfficialPositionId, OfficialPositions.PositionName, Divisions.DivisionId, Divisions.DivisionName
FROM Persons INNER JOIN ((Divisions INNER JOIN OfficialPositions ON Divisions.DivisionId = OfficialPositions.DivisionId) INNER JOIN (Games INNER JOIN Games2Persons ON Games.GameId = Games2Persons.GameId) ON OfficialPositions.OfficialPositionId = Games2Persons.OfficialPositionId) ON Persons.PersonId = Games2Persons.PersonId
ORDER BY Persons.PersonId, Games.GameStartDt;

Query results
PersonId      NameLast      NameFirst      GameId      GameNo      GameStartDt      GameLength      OfficialPositionId      PositionName      DivisionId      DivisionName
1      RefA      NameA      1      1*1*1      7/9/11 12:00 PM      60      1      Center1      1      U10
1      RefA      NameA      6      1*1*6      7/9/11 2:20 PM        70      3      Center1      2      U12
1      RefA      NameA      9      1*1*9      7/9/11 4:00 PM              60      1      Center1      1      U10
1      RefA      NameA      10      1*1*10      7/9/11 4:40 PM              70      3      Center1      2      U12
2      RefB      NameB      2      1*1*2      7/9/11 12:00 PM      70      3      Center1      2      U12
2      RefB      NameB      3      1*1*3      7/9/11 1:00 PM         60      1      Center1      1      U10
2      RefB      NameB      8      1*1*8      7/9/11 3:30 PM        70      3      Center1      2      U12
50      RefC      NameC      4      1*1*4      7/9/11 1:10 PM        70      3      Center1      2      U12
50      RefC      NameC      5      1*1*5      7/9/11 2:00 PM        60      1      Center1      1      U10
50      RefC      NameC      7      1*1*7      7/9/11 3:00 PM             60      1      Center1      1      U10

I need a query to return these conflicts:
RefA conflicts:
Gameid      GameNo      GameStartDt      GameLength
9              1*1*9      7/9/11 4:00 PM          60
10             1*1*10      7/9/11 4:40 PM          70

RefB conflicts:
Gameid      GameNo      GameStartDt      GameLength
2      1*1*2      7/9/11 12:00 PM      70
3      1*1*3      7/9/11 1:00 PM       60

RefC conflicts:
Gameid      GameNo      GameStartDt      GameLength
4              1*1*4      7/9/11 1:10 PM        70
5               1*1*5      7/9/11 2:00 PM        60
E43509-497508.flv
RefAssignGamesBlockageSample.mdb
Join the community to see this answer!
Join our exclusive community to see this answer & millions of others.
Unlock 2 Answers and 9 Comments.
Join the Community
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 2 Answers and 9 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros