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5> IF OBJECT_ID('dbo.Sessions') IS NOT NULL
6> DROP TABLE dbo.Sessions;
7> GO
1>
2> CREATE TABLE dbo.Sessions
3> (
4> keycol INT NOT NULL IDENTITY PRIMARY KEY,
5> app VARCHAR(10) NOT NULL,
6> usr VARCHAR(10) NOT NULL,
7> starttime DATETIME NOT NULL,
8> endtime DATETIME NOT NULL,
9> CHECK(endtime > starttime)
10> );
11> GO
1>
2> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user1', '20060212 08:30', '20060212 10:30');
3> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user2', '20060212 08:30', '20060212 08:45');
4> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user1', '20060212 09:00', '20060212 09:30');
5> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user2', '20060212 09:15', '20060212 10:30');
6> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user1', '20060212 09:15', '20060212 09:30');
7> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user2', '20060212 10:30', '20060212 14:30');
8> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user1', '20060212 10:45', '20060212 11:30');
9> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app1', 'user2', '20060212 11:00', '20060212 12:30');
10> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user1', '20060212 08:30', '20060212 08:45');
11> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user2', '20060212 09:00', '20060212 09:30');
12> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user1', '20060212 11:45', '20060212 12:00');
13> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user2', '20060212 12:30', '20060212 14:00');
14> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user1', '20060212 12:45', '20060212 13:30');
15> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user2', '20060212 13:00', '20060212 14:00');
16> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user1', '20060212 14:00', '20060212 16:30');
17> INSERT INTO dbo.Sessions(app, usr, starttime, endtime) VALUES('app2', 'user2', '20060212 15:30', '20060212 17:00');
18> GO
1>
2> SELECT DISTINCT app, usr, starttime AS s
3> FROM dbo.Sessions AS O
4> WHERE NOT EXISTS
5> (SELECT * FROM dbo.Sessions AS I
6> WHERE I.app = O.app
7> AND I.usr = O.usr
8> AND O.starttime > I.starttime
9> AND O.starttime <= I.endtime);
10> GO
app usr s
---------- ---------- -----------------------
app1 user1 2006-02-12 08:30:00.000
app1 user1 2006-02-12 10:45:00.000
app1 user2 2006-02-12 08:30:00.000
app1 user2 2006-02-12 09:15:00.000
app2 user1 2006-02-12 08:30:00.000
app2 user1 2006-02-12 11:45:00.000
app2 user1 2006-02-12 12:45:00.000
app2 user1 2006-02-12 14:00:00.000
app2 user2 2006-02-12 09:00:00.000
app2 user2 2006-02-12 12:30:00.000
app2 user2 2006-02-12 15:30:00.000
1>
2> drop table sessions;
3> GO
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