sql - ora-00936 missing expes -

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i can't find what's wrong in code.

update order_items o set (discount_amount) = select t.maxdiscount (select customer_id , o.order_id order_id, d.product_id product_id, d.total, e.maxdiscount maxdiscount orders o, (select sum(quantity)as total, order_id, product_id order_items group order_id, product_id)  d, (select max(discount_amount)  maxdiscount, product_id order_items group product_id) e o.order_id  = d.order_id , e.product_id = d.product_id) t exists t.order_id = o.order_id , t.product_id = o.product_id;

the message is:

  1. 00000 - "missing expression"

no idea what's problem. in advance!

   update order_items o    set discount_amount =           (select t.maxdiscount              (select customer_id,                           o.order_id order_id,                           d.product_id product_id,                           d.total,                           e.maxdiscount maxdiscount                      orders o,                           (  select sum (quantity) total,                                     order_id,                                     product_id                                order_items                            group order_id, product_id) d,                           (  select max (discount_amount) maxdiscount,                                     product_id                                order_items                            group product_id) e                         o.order_id = d.order_id                           , e.product_id = d.product_id) t             t.order_id = o.order_id , t.product_id = o.product_id);

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