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POMS-SQL Server search table using assembled criteria
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copied!<p>I have a search page that returns results according to the criteria nominated and this works ok when each criteria is OR but when I use AND it returns bad or no results. For example the search criteria might be...</p> <pre><code>A. Author = "" B. Subject = "" C. Keyword = "" D. Dated = "" </code></pre> <p>Code:</p> <pre><code>SELECT * FROM Table WHERE Author = '" & strAuthor & "' AND Subject = '" & strSubject & "' AND Keyword = '" & strKeyword & "' AND Dated = '" & strDated & "' " </code></pre> <p>Here I have used only 4 parameters whereas in fact there are quite a few more. But the example should explain the problem... to make this work I would need to be more specific such as "if A and B" or "B, C and D" but using any parameters that are blank or NULL will not work.</p> <p>Now I could write in the criteria using a conditional statement like...</p> <pre><code>SELECT * FROM Table WHERE if strAuthor <> "" then Author = '" & strAuthor & "' end if if strSubject <> "" then AND Subject = '" & strSubject & "' end if </code></pre> <p>and so on, except that writing <code>SELECT</code> strings like this does not work, just produces errors because the select string cannot contain additional code (that has been my finding).</p> <p>If the options were only a few I could write separate select strings for each combination, but there are more than 10 different criteria which entail more than 3,628,800 combinations!</p> <p>Is there a solution for this?</p>

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