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POSQL Server Creating complicated SQL Query for 3 tables
 

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  1. POSQL Server Creating complicated SQL Query for 3 tables
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    <p>Please help me creating this SQL query for SQL Server 2008.</p> <p>I've wasted 1 day thinking of this but I cannot find the solution:</p> <p>I have 3 [tables] with respective (columns):</p> <ul> <li><code>[table_users]</code> TB1 <code>(Id, Name)</code></li> <li><code>[table_schedule]</code> TB2 <code>(Id, userId, dateScheduled)</code></li> <li><p><code>[table_schedule_confirmation]</code> TB3 <code>(Id, scheduleId, confirmationStatus)</code></p> <p>confirmationStatus -> 0 = cancelled, 1 = confirmed</p></li> </ul> <p>I must filter <code>[TB1]</code> by selecting a day, it must list only user names that:</p> <ul> <li>are not scheduled at all (<code>userId</code> doesn't exist in <code>[TB2]</code> for selected day)</li> </ul> <p>or</p> <ul> <li>if scheduled, there's a matching confirmation for (<code>scheduleId</code>) in <code>[TB3]</code> and (<code>confirmationStatus</code>) must be 0 (cancelled)</li> </ul> <p>Problems:</p> <ul> <li>There can be more than one entries in <code>TB2</code> and <code>TB3</code> for a <code>userId</code> and date</li> </ul> <p>Date Filter = 31/03/2013</p> <p>Situation 1 (1 confirmed schedule):</p> <p><a href="http://img255.imageshack.us/img255/1508/sqld.png" rel="nofollow noreferrer">Situation1 http://img255.imageshack.us/img255/1508/sqld.png</a></p> <p>As you can see, I've scheduled 4 times for user 1, but he cancelled the 3 first, confirming only on the 4th time.</p> <p>Situation 2 (1 pending schedule):</p> <p><a href="http://img854.imageshack.us/img854/8116/sql2s.png" rel="nofollow noreferrer">Situation1 http://img854.imageshack.us/img854/8116/sql2s.png</a></p> <p>In this case, user hasn't confirmed the 4th (id=16) schedule yet.</p> <p>Situation 3 (all schedules cancelled):</p> <p><a href="http://img41.imageshack.us/img41/5720/sql3s.png" rel="nofollow noreferrer">Situation1 http://img41.imageshack.us/img41/5720/sql3s.png</a></p> <p>User cancelled all the 4 schedules.</p> <p>Situation 4 (no schedules for user on that date):</p> <p><a href="http://img255.imageshack.us/img255/9679/sql4.png" rel="nofollow noreferrer">Situation1 http://img255.imageshack.us/img255/9679/sql4.png</a></p> <p>No schedules for selected day.</p> <p>In resume:</p> <p>Filtering by date, I must list only users that applies to Situations 3 and 4 and NOT applies to Situations 1 and 2 !</p> <p>I must make this filter, to populate a dropdown with only users that are available for that day.</p> <p>This is what I've tried so far:</p> <pre><code>DECLARE @dataAg datetime SET @dataAg = '2013/03/31 16:30' SELECT T1.id, T1.name FROM [tbl_users] T1 WHERE (NOT EXISTS (SELECT * FROM [tbl_schedule] T2 WHERE T2.userId = T1.id AND CONVERT(date,T2.scheduledDate) = CONVERT(date, @dataAg)) ) OR (EXISTS (SELECT * FROM [tbl_schedule] T2, [tbl_scheduleConfirmation] T3 WHERE T2.id = T3.idSchedule AND T2.userId = T1.id AND CONVERT(date,T2.scheduledDate) = CONVERT(date, @dataAg)) AND NOT EXISTS (SELECT * FROM [tbl_schedule] T2, [tbl_scheduleConfirmation] T3 WHERE T2.id = T3.idSchedule AND T3.confirmation = 1 AND T2.idUser = T1.id AND CONVERT(date, T2.scheduledDate) = CONVERT(date, @dataAg)) ) </code></pre>
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    1. COThis question does not show any research effort. It is important to **do your homework**. Tell us what you found and ***why*** it didn't meet your needs. This demonstrates that you've taken the time to try to help yourself, it saves us from reiterating obvious answers, and most of all it helps you get a more specific and relevant answer. [FAQ](http://stackoverflow.com/questions/how-to-ask).
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