mysql use the selected variable in the same query -

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i have table 'booking_summary' stores type of method (method = air or sea). have join table 1 of 2 other tables depending on method column.

if method air,then table join booking_air,if sea booking_sea. not want run multiple queries on particular page.

this latest attempt,that has failed.the table_name alias table want in same query. 

$sql = "select case when a.shipping_method = 'sea' 'booking_sea' else 'booking_air' end 'table_name',                 case when a.user_id ='$active_id' 'y' else 'no' end 'generate_access',                 case when c.mbl null 'pending' else c.mbl end 'mbl_status',                 case when c.hbl null 'pending' else c.hbl end 'hbl_status',                 a.*,b.user_name                  booking_summary                 left join registered_users b                  on a.user_id = b.user_id                 left join table_name c                 on a.id = c.id                 (a.user_id = '$active_id' or a.forwarder='$active_id')";

any advice helpful. thanks

om i'm not sure if going work but, anyhow...

$sql = "select case                  when a.user_id ='$active_id' 'y'                  else 'no' end 'generate_access',             if(a.shipping_method = 'sea',                 case when c.mbl null 'pending' else c.mbl end,                 case when d.mbl null 'pending' else d.mbl end ) 'mbl_status',             if(a.shipping_method = 'sea',                 case when c.hbl null 'pending' else c.hbl end,                 case when d.hbl null 'pending' else d.hbl end ) 'hbl_status',                  a.*,b.user_name                  booking_summary                 left join registered_users b  on a.user_id = b.user_id                 left join booking_sea c  on a.id = c.id                 left join bookin_air d on a.id=d.id                 (a.user_id = '$active_id' or a.forwarder='$active_id')";

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