hi all,

          I am trying to execute query with some posted value the query is
like this

 $sql = "SELECT DISTINCT `csd`.`store_id` ,`csd`.`campaign_id`, `csd`.`date`
, `c`.`campaign_id` ,        `c`.`supplier_id` , `cm`.`sub_category_id`
FROM `campaign_store_dates` AS `csd`
LEFT JOIN `campaigns` AS `c` ON `csd`.`campaign_id` = `c`.`campaign_id`
LEFT JOIN `campaign_media` AS `cm` ON `c`.`campaign_id` = `cm`.`campaign_id`
WHERE `c`.`status` NOT
IN (
'request', 'cancelled'
) AND `csd`.`store_id` != '0'
";
    if (!empty($strDate) and !empty($endDate)){
                $sql .= " AND `csd`.`date` BETWEEN '$strDate' AND
'$endDate'";
            }
    if (isset($sub_category_id)){
                $sql .= " AND `cm`.`sub_category_id` = {$sub_category_id}";
            }
in if condition i am checking wether the value is there r not the query is
working fine when value is set. if value is not set at that time the query
is not working and giving error like

*SQL Error:* 1054: Unknown column 'empty' in 'where clause'
please give me sugitions

Thanks in advance
A.RAKESH

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