626 626 - 7 months ago 10
SQL Question

MySQL Join two tables with comma separated values

I have 2 tables as below

Notes Table

╔══════════╦═════════════════╗
║ nid ║ forDepts ║
╠══════════╬═════════════════╣
║ 1 ║ 1,2,4 ║
║ 2 ║ 4,5 ║
╚══════════╩═════════════════╝


Positions Table

╔══════════╦═════════════════╗
║ id ║ name ║
╠══════════╬═════════════════╣
║ 1 ║ Executive ║
║ 2 ║ Corp Admin ║
║ 3 ║ Sales ║
║ 4 ║ Art ║
║ 5 ║ Marketing ║
╚══════════╩═════════════════╝


I am looking to query my Notes table and associate the 'forDepts' column with values from the Positions table.

The output should be:

╠══════════╬════════════════════════════╣
║ 1 ║ Executive, Corp Admin, Art ║
║ 2 ║ Art, Marketing ║
╚══════════╩════════════════════════════╝


I know that the database should be normalized but I cannot change the database structure for this project.

This is going to be used to export a excel file with the code below.

<?PHP

$dbh1 = mysql_connect($hostname, $username, $password);
mysql_select_db('exAdmin', $dbh1);


function cleanData(&$str)
{
$str = preg_replace("/\t/", "\\t", $str);
$str = preg_replace("/\r?\n/", "\\n", $str);
if(strstr($str, '"')) $str = '"' . str_replace('"', '""', $str) . '"';
}

$filename = "eXteres_summary_" . date('m/d/y') . ".xls";

header("Content-Disposition: attachment; filename=\"$filename\"");
header("Content-Type: application/vnd.ms-excel");
//header("Content-Type: text/plain");

$flag = false;


$result = mysql_query(
"SELECT p.name, c.company, n.nid, n.createdOn, CONCAT_WS(' ',c2.fname,c2.lname), n.description
FROM notes n
LEFT JOIN Positions p ON p.id = n.forDepts
LEFT JOIN companies c ON c.userid = n.clientId
LEFT JOIN companies c2 ON c2.userid = n.createdBy"
, $dbh1);



while(false !== ($row = mysql_fetch_assoc($result))) {
if(!$flag) {
$colnames = array(
'Created For' => "Created For",
'Company' => "Company",
'Case ID' => "Case ID",
'Created On' => "Created On",
'Created By' => "Created By",
'Description' => "Description"
);
// display field/column names as first row
echo implode("\t", array_keys($colnames)) . "\r\n";
$flag = true;
}


$row['createdOn'] = date('m-d-Y | g:i a', strtotime($row['createdOn']));

array_walk($row, 'cleanData');
echo implode("\t", array_values($row)) . "\r\n";
}
exit;

?>


This code outputs only the first value of 'forDepts'

Exa: Executive (instead of Executive, Corp Admin, Art)

Can this be accomplished by CONCAT or FIND_IN_SET?

Please help! Thanks in advance!

Answer
SELECT  a.nid,
        GROUP_CONCAT(b.name ORDER BY b.id) DepartmentName
FROM    Notes a
        INNER JOIN Positions b
            ON FIND_IN_SET(b.id, a.forDepts) > 0
GROUP   BY a.nid