sd and ed
$meta_query = array( 'relation' => 'OR', array( 'key' => 'cqt_e_start_date', 'value' => 'sd', 'compare' => 'IN', ), array( 'key' => 'cqt_end_date', 'value' => 'ed', 'compare' => 'IN', ), );
$meta_query = array( 'relation' => 'OR', array( 'key' => 'cqt_e_start_date', 'value' => 'sd', 'compare' => 'IN', ), array( 'key' => 'cqt_end_date', 'value' => 'ed', 'compare' => 'IN', ), );