Problem with Join Queries using PHP and an Orcale Database

Question

Ok, I am trying to build a simple php querying tool for my oracle database and for the most part it is working however I am having a problem getting data from my join queries. If I run the following query :
QUERY:
SELECT lastfirst,EnteredBy,Debit FROM students sts JOIN GLDetail gl ON gl.studentid=sts.id
RESULT SET:
Lastfirst     EnteredBy     Debit
caiu, test      204     1
But when I run the query correctly I get no results
QUERY:
SELECT sts.lastfirst,gl.EnteredBy,gl.Debit FROM students sts JOIN GLDetail gl ON gl.studentid=sts.id
RESULT SET:
sts.lastfirst     gl.EnteredBy     gl.Debit
and if I run the query combining the two above methods and adding a field (schoolid) that has the same name on both table I get the following result sets
QUERY:
SELECT lastfirst,EnteredBy,Debit,sts.schoolid FROM students sts JOIN GLDetail gl ON gl.studentid=sts.id
RESULT SET:
lastfirst     EnteredBy     Debit     sts.schoolid
caiu, test      204     1     
QUERY:
SELECT lastfirst,EnteredBy,Debit,schoolid FROM students sts JOIN GLDetail gl ON gl.studentid=sts.id
RESULT SET:
NONE
Therefore, I have to have something written incorrectly in my php code and I just can not figure it out. My entire code is pasted below please provide me with an assistance you might have to offer. I have change the odbc_connec line so I could post it to this forum. In addition, I had to phrase out the column headers there for when you write the column headers you have to use ~ instead of , as the separator and then I turn back into the correct format for sql.
//These scripts just open help windows if somone clicks on the icon
<script>
function submit()
{document.sqlform.submit();}
</script>
<script>
function colwin(){
window.open("colnames.php",null,"height=300,width=400,scrollbars=1");}
</script>
<script>
function tabwin(){
window.open("tablenames.php",null,"height=300,width=400,scrollbars=1");}
</script>
<script>
function help(){
window.open("http://www.w3schools.com/sql/default.asp",null,"height=500,width=700,scrollbars=1");}
</script>
<form method="post" action="<?php echo $PHP_SELF;?>" name="sqlform">
<?php
//Cookie to check for authorization to the site
if($_COOKIE['cookie']=="CheckCookieForAuth")
//These get the values of the textareas after the form has been submitted
$sqlSELECT = $_POST["SELECT"];
$sqlFROM = $_POST["FROM"];
$sqlJOIN = $_POST["JOIN"];
$sqlWHERE = $_POST["WHERE"];
$sqlOTHER = $_POST["OTHER"];
$sqlSELECTTYPE = $_POST["SELECTTYPE"];
//This is the variable used to parse out my headers the user entered
$sqlColNames = split('~',$sqlSELECT);
//This converts the ~ separator to , so I can actually use it as part of my sql string
$search = array('~');
$replace = array(',');
$mystring = $sqlSELECT;
$sqlString = str_replace($search, $replace, $mystring);
//These are the textareas and the drop down options that the end users has to create queries
echo "<table border=0>";
echo "<tr><td valign='top'>";
echo "<B>SELECT TYPE</B> <BR><SELECT NAME=SELECTTYPE>
<OPTION VALUE='SELECT' SELECTED>SELECT</OPTION>
<OPTION VALUE='SELECT DISTINCT'>SELECT DISTINCT</OPTION>
<OPTION VALUE='INSERT'>INSERT</OPTION>
<OPTION VALUE='UPDATE'>UPDATE</OPTION>
<OPTION VALUE='DELETE'>DELETE</OPTION>
</SELECT>";
echo "</td><td>";
echo "<textarea rows=2 cols=75 name=SELECT wrap=physical>$sqlSELECT</textarea>";
echo "</td><td valign='top'>";
echo "<img src='images/sqlC.jpg' width='25' height='25' onclick='colwin()'>";
echo "</td></tr>";
echo "<tr><td valign='top'>";
echo "<b>FROM</b>";
echo "</td><td>";
echo "<textarea rows=2 cols=75 name=FROM wrap=physical>$sqlFROM</textarea>";
echo "</td><td valign='top'>";
echo "<img src='images/sqlT.jpg' width='25' height='25' border=0 onclick='tabwin()'>";
echo "</td></tr>";
echo "<tr><td valign='top'>";
echo "<b>JOIN</b>";
echo "</td><td>";
echo "<textarea rows=2 cols=75 name=JOIN wrap=physical>$sqlJOIN</textarea>";
echo "</td></tr>";
echo "<tr><td valign='top'>";
echo "<b>WHERE</b>";
echo "</td><td>";
echo "<textarea rows=2 cols=75 name=WHERE wrap=physical>$sqlWHERE</textarea>";
echo "</td></tr>";
//This is where the end user would enter group by, having, order by, etc..
echo "<tr><td valign='top'>";
echo "<b>OTHER</b>";
echo "</td><td>";
echo "<textarea rows=2 cols=75 name=OTHER wrap=physical>$sqlOTHER</textarea>";
echo "</td></tr>";
This is a run query icon and a help icon
echo "<tr><td colspan=2 align=right>";
echo "<img src='images/RunQuery.jpg' width='30' height='28' onclick='submit()'> <img src='images/qm.jpg' border=0 width='25' height='25' onclick='help()'>";
echo "</td></tr></table>";
echo "<br>";
echo "<br>";
//This is where I connect to my remote oracle database
     $conn=odbc_connect('ODBC_ConnectionName','USERNAME','PASSWORD');
//This is the sql string created by the end users
     $sql="$sqlSELECTTYPE $sqlString FROM $sqlFROM $sqlJOIN $sqlWHERE $sqlOTHER";
//This executes the connection string and the sql string
     $rs=odbc_exec($conn,$sql);
//This will display the query or a message if the query is empty
     if($rs!=NULL){
     echo "<table border=1>";
     echo "<tr>";
//This loops through the string array the end user enter the field name text area to get column headers
     for($i=0; $i<count($sqlColNames); $i++)
     echo "<td>";
     print_r($sqlColNames[$i]);
     echo "</td>";
     echo "</tr><tr>";
//This actually fetchs the rows from the statement and then display the data based on the column names the end user speificed
     while (odbc_fetch_row($rs))
          for($i=0; $i<count($sqlColNames); $i++)
               $results=odbc_result($rs,$sqlColNames[$i]);
               echo "<td>$results</td>";
          echo "</tr>";
     odbc_close($conn);
     echo "</table>";}else{echo "Results will be displayed here";}
echo "<br><br>";
echo $sql;
else
echo "Not logged in";
?>
</form>

Answer 1

This looks more like a SQL question than a PHP issue. There are a couple of JOIN examples at http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_10002.htm#i2066611 that might you work through the problem.