Oracle sql not exists deletes all my records -


i have following tables

product product_id parent_product_id  product_details product_id percent

and parent tables:

parent_product parent_product_id description_1  parent_product_details parent_product_id percent

what need logic delete product_detail not exists(..the data parent_product_detail)

and

insert product_detail not exists (data parent_product_details)

when execute 

delete product_details pd not exists   (select ppd.*     parent_product pp,          parent_product pd,          product p,          parent_product_details ppd,          ,product_details pd          pp.parent_product_id = '172'           , pd.parent_product_id = ppd.parent_product_id             , ppd.parent_product_id = pp.parent_product_id          , pd.product_id = p.product_id -- filter    )   /  rollback /  1040 rows deleted   roll completed

the problem have product doesn't have product details. when the subquery selected / execute shows 1 result 

select ppd.*         parent_product pp,              parent_product pd,              product p,              parent_product_details ppd,              --,product_details pd              pp.parent_product_id = '172'               , pd.parent_product_id = ppd.parent_product_id                 , ppd.parent_product_id = pp.parent_product_id              --and pd.product_id = p.product_id -- filter

how go deleting product_details records no longer present in parent_product_details , add new ones insert not exists logic?

i think want correlated subquery. need fix syntax use proper join syntax, not archaic commas-in-the-from-clause thing:

delete product_details pd not exists (select 1                   parent_product pp join                        parent_product_details ppd                        on ppd.parent_product_id = pp.parent_product_id join                        parent_product mc                        on mc.parent_product_id = ppd.component_parent_product_id                        product p                        on p.parent_product_id = pp.parent_product_id                   pp.parent_product_id = '172' ,                         pd.product_id = p.product_id -- filter                   );

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