Change the date for the 1st record of a link in oracle sql -


i have query want change sales_date '01.01.1800' 1st record product. means want unique product stored in product_id , check first sales_date on product loaded , change sales_date '01.01.1800'. believe can use rank function haven't used before , there might solution trying write query this. product_id value not unique in column.

select product_id,sales_date sales_details

no need rank, can lowest dates using correlated subquery:

select * sales_details sd sales_date <> date '1800-01-01' -- don't update if there's row date   , sales_date = -- find row lowest date       ( select min(sales_date)         sales_details sd2         sd.product_id = sd2.product_id       )

when checked it's correct data switch update:


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