table on myposgreSQL... I have to 2 foreign key which are book_id on Books table, customer _id on customer and order table .... please ,how do I create it?
We won't do your homework. But you may learn it from https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-foreign-key/
also, please learn skills like PASTE BIN. Where you can paste your text from your computer. And generate a CODE to share the text with others via your phone. PREFERRED... Install Telegram Desktop on your computer. And then... Crazy.... Copy and PASTE your SQL / error messages, etc. Right into the message. This makes it 1000 times easier for MORE people to help you. https://pastebin.com/
They also asked this in the same tone in private DM.
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