Database

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$connectionInfo = array( "Database"=>$myDB, "UID"=>$myUser , "PWD"=>$myPass);
$conn = sqlsrv_connect( $myServer, $connectionInfo);

$query = "SELECT * FROM( SELECT col0, col1, col2, col3 FROM t1 LEFT JOIN t2 ON t1.col1 = t2.col1 LEFT JOIN t3 ON t1.col2 = t3.col2) AS t ORDER BY t.col0; ";
$rec_set = sqlsrv_query($connection, $query, array(), array("Scrollable" => 'buffered'));

if( $rec_set === false ) die( print_r( sqlsrv_errors(), true));  

$connectionInfo = array( "Database"=>$myDB,  UID"=>$myUser , "PWD"=>$myPass);
$conn = sqlsrv_connect( $myServer, connectionInfo);

$query = "SELECT * FROM( SELECT col0, col1, col2, col3 FROM t1 LEFT JOIN t2 ON t1.col1 = t2.col1 LEFT JOIN t3 ON t1.col2 = t3.col2) AS t ORDER BY t.col0; ";

$rec_set = sqlsrv_query($connection, $query, array(),  array("Scrollable" => 'buffered'));
if( $rec_set === false ) die( print_r( sqlsrv_errors(), true));	
			 
$row_count = sqlsrv_num_rows($rec_set);
if ($row_count === false) die( print_r( sqlsrv_errors(), true));

$reg   = sqlsrv_fetch_array( $rec_set, SQLSRV_FETCH_ASSOC, 0);
$first = $reg['column_name'];

$reg   = sqlsrv_fetch_array( $rec_set, SQLSRV_FETCH_ASSOC, $row_count - 1);
$last  = $reg['column_name'];

SELECT OD.UPC, OH.OrderId, COUNT(DISTINCT OH.OrderId) [COUNT]
FROM OrderDetail OD
LEFT JOIN OrderHeader OH ON OH.OrderHeaderId = OD.OrderHeaderId
GROUP BY OD.UPC, OH.OrderId
HAVING COUNT(DISTINCT OH.OrderId) > 1

SELECT column_name(s) FROM table1
UNION
SELECT column_name(s) FROM table2 ORDER BY 3