sql server - Left Join multiple tables on a parent table and subtract one column from the parent table -

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i have 3 tables (donor_detail, items & store) left joined on 1 parent table (donated_items), there column quantity in parent table wish subtract table's column issued_donation.issued_quantity here sql left joins not understanding how should subtract column. i.e. donated_items.quantity - issued_donation.issued_quantity

select t1.*, t2.donor_name,t2.id, t3.id,t3.item_name, t4.store_name, t4.id donated_items t1 left join donor_detail  t2 on t1.donor_id = t2.id left join items  t3 on t1.item_id = t3.id left join stores  t4 on t1.store_id = t4.id

your question isn't clear, suspect you're talking subtracting values, not columns. if i'm right, have join other table (issued_donation) , can add selected fields t1.quantity - t5.issued_quantity remainingquantity.


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