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Newbie question , what the symbols means

User_ULX4X
User_ULX4X Member Posts: 19 Green Ribbon
Attach the database ER diagram , as you can see , there are symbols in front of the keys , eg. P , F , FK, key , red asterisk , two green lines , U etc , just would like to know what this symbols represent , what is its function ? is there any documnet on web explains it that I can refer to ?

thanks


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