Under that main menu you can have other sub menus or functions.

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Names – even rare ones like Ross Geller –  do not uniquely identify a record, so we need something that does. Go get your address book again.Remember I’d said the data in databases is organised in groups – all the names over here, the phone numbers over there, the addresses over in that other place?

There is a long list of data types that Oracle recognises, but we’ll only focus on the 3 main types.There is one interesting difference between the VARCHAR2 and NUMBER data types, and that is that you can only store numbers in NUMBER columns; however, you can record any string of alphanumeric characters in VARCHAR2 columns. In the next article, we’ll be learning SQL, the language of databases.Fortnightly newsletters help sharpen your skills and keep you ahead, with articles, ebooks and opinion to keep you informed.Fortnightly newsletters help sharpen your skills and keep you ahead, with articles, ebooks and opinion to keep you informed.David Njoku is a software developer at CACI. Well, those groupings are called tables.So in our little database we have a FRIEND_NAME table, a PHONE_NUMBER table, and an ADDRESS table.

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