How to understand the procedures and functions in the database

This article mainly introduces "how to understand the processes and functions in the database". In the daily operation, I believe that many people have doubts about how to understand the processes and functions in the database. I have consulted all kinds of materials and sorted out the simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "how to understand the processes and functions in the database". Next, please follow the editor to study!

Which of the following statements are true about the differences between functions and procedures?

(A)

Only functions can execute RETURN statements.

(B)

Only functions can be called from within SQL.

(C)

Only procedures can take OUT or IN OUT parameters.

(D)

Only a process can be defined as an autonomous transaction.

(E)

Only procedures can be called from triggers.

(F)

Only a function can be treated as part of an expression.

(G)

Functions can only call other functions. A procedure can call a function or procedure.

Answer BF.

It is important to note that C, although functions can take output parameters, this usage is meaningless and confusing.

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