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    <p>I've had a similar problem to solve.<br/> <br/> First, you have to understand you're looking for a Not reserved car in a database containing your reserved cars...<br/> <br/> You're looking for information that IS NOT in you database!<br/> But you can deduct it from what you've got.<br/></p> <p>To simplify the comparison challenge, you should join your date and time (in your reservation table and in the two user criterias -start and end-) to a "timestamp" format... It will be easier to compare all your existing reservations to the user request.<br/> see: <a href="http://db.apache.org/derby/docs/10.7/ref/rrefsqlj27620.html" rel="nofollow">http://db.apache.org/derby/docs/10.7/ref/rrefsqlj27620.html</a> for format info.<br/> <br/></p> <p>So you have to look for your reserved cars using your user data (start and end timestamps) and filter them OUT of all your possible cars.<br/> <br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UserStart&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UserEnd<br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<br/> case A&nbsp;&nbsp;|------|&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<br/> case B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|--|--------|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<br/> case C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;|----------|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<br/> case D&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|-------|---|<br/> case E&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|----------|<br/> case F&nbsp;&nbsp;&nbsp;|--------|------------------|----------------|<br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<br/> <br/> <br/> You want cases A and E.<br/> <br/> This script should find out cases B,C,D and F... And place all the CarIDs into an array I called "NotAvaibleCars".<br/> It forgets about cases A and E (past/finished reservations and future reservations).<br/> <br/> Then, you have to check, for each cars, if its ID is "inArray" before to show it on your result page.<br/> <br/> Code:<br/></p> <pre><code>$allReservedCars = mysql_query("SELECT * from reservation") or die(mysql_error()); $allCars = mysql_query("SELECT * from cars") or die(mysql_error()); $NotAvailableCars = array(); $userStart = $_POST['yourClientStartCriteria']; $userEnd = $_POST['yourClientEndCriteria']; while ($allCarsCheck = mysql_fetch_array($allReservedCars)){ $TimestampStart = $allCarsCheck['startDate'] . ' ' . $allCarsCheck['startTime']; $TimestampEnd = $allCarsCheck['startDate'] . ' ' .$allCarsCheck['startTime']; if ( (($TimestampStart&gt;$userStart)&amp;&amp;($TimestampStart&lt;$userEnd)) || // if cases C or D (A reservation start already exist for this car between userStart and userEnd) (($TimestampEnd&gt;$userStart)&amp;&amp;($TimestampEnd&lt;$userEnd)) || // if case B or C (A reservation end already exist for this car between userStart and userEnd) (($TimestampStart&lt;$userStart)&amp;&amp;($TimestampEnd&gt;$userEnd)) // if case F (A reservation that wraps userStart and userEnd already exist for this car) ) { array_push($NotAvailableCars, $allCarsCheck['CarID']); // You have now an array of the NOT available cars. } } while($searchcars = mysql_fetch_array($allcars)) { if (inArray($searchcars['CarID'],$NotAvailableCars)){ //Do nothing! } else{ // Your code to show this available car. } } </code></pre> <p><br/></p> <p>;)<br/> <br/> <br/> Okay... I'm reading my solution again 8 hours later...<br/> And I see that I missed the main question: To show something when there is no car available for a make/model combinaison.<br/> <br/> I worked on it... And have a... Kind of a solution.<br/> But I hope there is a better one... This all I can see for now.<br/> <br/></p> <pre><code>$distinctMakeModel = mysql_query("SELECT distinct make, model from cars"); while ($row = mysql_fetch_array($distinctMakeModel)){ array_push($CarModelArray, $row['make'] . ' -splitter- ' . $row['model']) // Array with all make/model combination } $CarQtyArray = array(); for($i=0;$i&lt;$CarModelArray.length;$i++){ $thisCar = explode(' -splitter- ',$carModelArray[$i]); $ThisCarQty = mysql_query("SELECT count(*) from cars where make=$thisCar[0] AND model=$thisCar[1]"); $thiscar = mysql_fetch_array($ThisCarQty); array_push($CarQtyArray, $thiscar[0]; //So now you have an array of quantity with indexes matching the $carModelArray indexes. } </code></pre> <p>You now have an array of car make/model and an array of quantity with matching indexes.<br/> <br/> The next chunk of code will create an array of unavailable quantity with the same matching indexes.<br/></p> <pre><code>for($i=0;$i&lt;$CarModelArray.length;$i++){ $thisCar = explode(' -splitter- ',$carModelArray[$i]); $NotAvailableCarQtyArray[$i] = 0; for($j=0;$j&lt;$NotAvailableCars.length;$j++){ $thisNotAvailable = mysql_query("Select count(*) where make=$thisCar[$i] AND model=$thisCar[$i] AND carID=$NotAvailableCars[$j]"); $isThisTheModel = mysql_fetch_array($thisNotAvailable); if ($isThisTheModel&lt;&gt;'0'){ $NotAvailableCarQtyArray[$i] ++; } } } </code></pre> <p><br/> So now...<br/> in $CarModelArray[0], lets say you have Honda Civic.<br/> in $CarQtyArray[0], you have 3.<br/> in $NotAvailableCarQtyArray[0], you have 3 (all gone!).<br/> <br/></p> <pre><code>for ($i=0;$i&lt;$CarModelArray.length;$i++){ if ($CarQtyArray[$i]==$NotAvailableCarQtyArray[$i]){ echo $CarModelArray[$i] . ' are not available.&lt;br&gt;'; } } </code></pre> <p>This takes waaayyy to many queries here!!!<br/> It is not supposed to be a great idea to put a SQL query into a loop.<br/> But, again... I don't see how to do otherwise.<br/> <br/> It's like the amount of cars out between Start and End search multiplied by the amount of make/model you have.<br/> <br/> But it should work...<br/> At least I tried.<br/> ;)</p>
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