Function vs procedure decision in SQL - Quick Revision & Key Differences

Recall & Review

beginner

What is the main difference between a function and a procedure in SQL?

A function returns a value and can be used in SQL expressions, while a procedure performs actions but does not return a value directly.

beginner

When should you choose a function over a procedure?

Choose a function when you need to return a single value and use it inside SQL queries or expressions.

intermediate

Can a procedure return multiple result sets or perform complex operations?

Yes, procedures can return multiple result sets and perform complex operations like modifying data or controlling transactions.

beginner

Is it possible to call a procedure inside a SELECT statement?

No, procedures cannot be called inside SELECT statements because they do not return a value directly.

intermediate

Why might you use a procedure instead of a function for data modification?

Procedures are better for data modification because they can execute multiple statements and control transactions, while functions are limited in side effects.

Which SQL object returns a value and can be used inside a SELECT statement?

A View

B Procedure

C Function

D Trigger

Functions return values and can be used inside SELECT statements, unlike procedures.

Which is true about procedures in SQL?

A They can perform multiple operations and do not return a value directly

B They must return a value

C They can only be used in SELECT statements

D They cannot modify data

Procedures can perform multiple operations and do not return a value directly.

When deciding between function and procedure, which is best for complex data changes?

A Procedure

B Function

C View

D Index

Procedures are best for complex data changes because they can execute multiple statements and control transactions.

Can a function have side effects like modifying database tables?

A Yes, always

B No, functions should not modify data

C Only if called inside a procedure

D Only in some SQL dialects

Functions should not modify data; they are meant to return values without side effects.

Which SQL object is typically used to encapsulate reusable logic that returns a value?

A Table

B Procedure

C Trigger

D Function

Functions encapsulate reusable logic that returns a value.

Explain when you would use a function instead of a procedure in SQL.

Think about whether you need a value back to use in a query.

Describe the advantages of using a procedure for database operations.

Consider complex tasks and data changes.