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SQL Joins with ON Clause Quiz

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Questions and Answers

Which type of join should you use to display all rows from the first table and only matching rows from the second table?

Right outer join
Full outer join
Left outer join (correct)
Inner join

What is the result of a Cartesian product?

An output with all rows from the first table joined with all rows from the second table (correct)
An output with only matching rows from both tables
An output with no matches
An error message

When you join two tables without specifying a condition, what type of join is created?

Self-join
Equijoin
Outer join
Cartesian product (correct)

In a CROSS JOIN, what is produced between the two tables involved?

The cross-product or Cartesian product (B) Signup and view all the answers

What does a full (or two-sided) outer join include?

All rows from both tables, matching where possible and NULLs where not (A) Signup and view all the answers

What is the main issue with the SQL statement provided in the text?

No rows are returned by the subquery (C) Signup and view all the answers

Why does the outer query not return any rows even though the subquery result is null?

The outer query finds no employee with a job ID equal to null (A) Signup and view all the answers

What is the term used for subqueries that return more than one row?

Multiple-row subqueries (A) Signup and view all the answers

How should multiple-row subqueries be handled in SQL?

Use multiple-row operators with multiple-row subqueries (C) Signup and view all the answers

What happens in SQL when comparing two null values?

It yields a null value (A) Signup and view all the answers