In which case would you use a FULL OUTER JOIN ?

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  1. You want all unmatched data from both table

  2. You want all matched data from both table

  3. You want all matched and unmatched data from both table

  4. You want all unmatched data from one table

Show answer
Correct Option: A

AI Explanation

To answer this question, we need to understand the different types of joins in SQL.

A FULL OUTER JOIN returns all rows from both tables, including unmatched rows from both tables. It combines the results of a LEFT OUTER JOIN and a RIGHT OUTER JOIN.

Let's go through each option to understand why it is correct or incorrect:

Option A) You want all unmatched data from both tables - This option is correct because a FULL OUTER JOIN includes all unmatched data from both tables.

Option B) You want all matched data from both tables - This option is incorrect because a FULL OUTER JOIN includes both matched and unmatched data from both tables.

Option C) You want all matched and unmatched data from both tables - This option is incorrect because a FULL OUTER JOIN includes both matched and unmatched data, not just matched data.

Option D) You want all unmatched data from one table - This option is incorrect because a FULL OUTER JOIN includes unmatched data from both tables, not just one table.

The correct answer is Option A. A FULL OUTER JOIN is used when you want all unmatched data from both tables.

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