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SQL JOIN Clauses Quiz

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Questions and Answers

What type of join is formed when all rows in the first table are joined to all rows in the second table?

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

What type of join is formed when a join condition is omitted?

Right outer join
Inner join
Cartesian product (correct)
Left outer join

What does the CROSS JOIN clause produce between two tables?

Natural join
Equijoin
Non-equijoin
Cartesian product (correct)

When using full outer joins, how many rows would be included if there are 20 rows in the first table and 8 rows in the second table?

160 rows (C) Signup and view all the answers

Which type of join combines rows from both tables whether or not there is a match?

Full outer join (D) Signup and view all the answers

What data type will the returned values have if one query selects CHAR and the other query selects VARCHAR2?

VARCHAR2 (C) Signup and view all the answers

In the context of the text, what is the purpose of using the UNION operator in SQL?

To merge results of two or more SELECT statements (A) Signup and view all the answers

What is the significance of the COLUMN a_dummy NOPRINT command in the provided SQL statement?

It does not display 'a_dummy' in the output (B) Signup and view all the answers

How many queries are compiled together when using SET Operators according to the text?

Two queries (A) Signup and view all the answers

Which of the following is NOT an operator used as a SET Operator according to the text?

JOIN (B) Signup and view all the answers