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okay guys good morning first part of todays lecture were going to continue our discussion about the principle of the database system in general okay then after that were going to go over more details about the relational data model then talk about one of the query language in particular were going to talk about the relational algebra so just a quick review last lecture we talk about the data model so whats the data model what do you mean by the data model is the way that were going to use all the structures that you use in order to describe your data on database yeah then of course were going to use schema in order to describe the particular design that were going to use so for example im going to use the relational data model so what does that mean here this means im going to take my data and represent my data as tables or relations okay then im going to use a schema in order to write the right the exact description of this collection of data how it looks like so im gonna