Question: (a) Please list all FIVE AGGREGATE functions in SQL and give a simple description for each aggregate function. (b) In the view of E-R model,

(a) Please list all FIVE AGGREGATE functions in SQL and give a simple description for each aggregate function. (b) In the view of E-R model, the database can be modeled as two things. Please list these two things and explain their difference from the relation in relational model

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