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Harbour={ idH(pk), country, Hname,location} Ship={idS(pk) , Shipname, captain, capacity} Captain is a surname Capacity={capacity_type(pk) , from_cap, to_cap} For example small from 200-300 Medium 301- 800

Harbour={ idH(pk), country, Hname,location}

Ship={idS(pk) , Shipname, captain, capacity}

Captain is a surname

Capacity={capacity_type(pk) , from_cap, to_cap}

For example small from 200-300

Medium 301- 800

Docked (idD(PK) , harbour, ship, since, till, accepted_by)

Accepted_by is a surname of office worker who registered the visit

write a query

For each ship and each harbour show the date when the ship arrived there for the first time .

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