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POSelect with multiple clauses
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copied!<p><strong>Schema</strong></p> <p>I have 3 tables with the following columns:</p> <pre><code>tblClients [ClientID, ClientName, Client Contact] tblEvents [EventID, EventName] tblEventBook [EventBookID, EventID, ClientID] </code></pre> <ul> <li><code>tblEventBook EventID</code> matches <code>tblEvents EventID</code></li> <li><code>tblEventBook ClientID</code> matches <code>tblClients ClientID</code></li> </ul> <p>I have two parameters: <code>@useEventID</code> and <code>@useClientID</code></p> <p>I would like to retrieve all rows from <code>tblClient</code> where <code>tblEventBook</code> does not equal <code>useEventID</code> and <code>useClientID</code>.</p> <p>I tried to use the below, but it does not work:</p> <pre><code>SELECT * FROM tblClients WHERE tblEventBook.EventID <> @useEventID AND tblEventBook.ClientID <> @useClientID </code></pre> <p>Sample Data:</p> <p><strong>tblEventBook</strong></p> <pre><code>EventBookID EventID ClientID 1 1 1 2 2 2 3 3 1 4 4 2 </code></pre> <p><strong>tblClients</strong></p> <pre><code>ClientID ClientName ClientContact 1 TestNameA 12345 2 TestNameB 54321 </code></pre> <p><strong>tblEvents</strong></p> <pre><code>EventID EventName 1 TestEventA 2 TestEventB 3 TestEventC 4 TestEventD 5 TestEventE </code></pre> <p>Required results</p> <p>I need to get the below results when I use:</p> <ol> <li><p><code>@useClientID = 1, @useEventID = 1</code></p> <p>It should return <code>ClientID 2</code></p></li> <li><p><code>@useClientID = 2, @useEventID = 1</code></p> <p>It should return <code>ClientID 1 and 2</code></p></li> <li><p><code>@useClientID = 2, @useEventID = 2</code></p> <p>It should return <code>ClientID 1</code></p></li> <li><p><code>@useClientID = 5, @useEventID = 2</code></p> <p>It should return <code>ClientID 1 and 2</code></p></li> </ol>

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