Questions: Use the following data model for this question: Fish table fishuid name Daily catch table catchidd date FishCatch table fishcatchidid catchid fishuid Which of the following is a situation where a FULL OUTER JOIN could be useful? When a fisherman wants to see only fish in the database that they have caught When a fisherman wants to see all fish in the database, including those that they have caught before and those that they have not caught before When a fisherman wants to see only the fish that they have NOT caught When a fisherman wants to see the fish that belong to a certain species

Use the following data model for this question: Fish table fishuid name Daily catch table catchidd date FishCatch table fishcatchidid catchid fishuid Which of the following is a situation where a FULL OUTER JOIN could be useful? When a fisherman wants to see only fish in the database that they have caught When a fisherman wants to see all fish in the database, including those that they have caught before and those that they have not caught before When a fisherman wants to see only the fish that they have NOT caught When a fisherman wants to see the fish that belong to a certain species
Transcript text: Use the following data model for this question: Fish table fishuid name Daily catch table catchidd date Fish_Catch table fish_catchidid catchid fishuid Which of the following is a situation where a FULL OUTER JOIN could be useful? When a fisherman wants to see only fish in the database that they have caught When a fisherman wants to see all fish in the database, including those that they have caught before and those that they have not caught before When a fisherman wants to see only the fish that they have NOT caught When a fisherman wants to see the fish that belong to a certain species
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Solution

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The answer is the second one: When a fisherman wants to see all fish in the database, including those that they have caught before and those that they have not caught before.

Explanation for each option:

  1. When a fisherman wants to see only fish in the database that they have caught: This situation would typically require an INNER JOIN between the Fish table and the Fish_Catch table, as it involves retrieving only the records that exist in both tables.

  2. When a fisherman wants to see all fish in the database, including those that they have caught before and those that they have not caught before: A FULL OUTER JOIN is useful here because it combines the results of both LEFT JOIN and RIGHT JOIN. It returns all records when there is a match in either the Fish table or the Fish_Catch table, including fish that have been caught and those that have not been caught.

  3. When a fisherman wants to see only the fish that they have NOT caught: This situation would typically require a LEFT JOIN combined with a WHERE clause to filter out the records where the catch information is NULL, indicating fish that have not been caught.

  4. When a fisherman wants to see the fish that belong to a certain species: This situation would require filtering based on species, which is not directly related to the use of a FULL OUTER JOIN. It would likely involve a simple SELECT query with a WHERE clause specifying the species.

In summary, a FULL OUTER JOIN is most appropriate for the second option, as it allows the fisherman to see all fish, regardless of whether they have been caught or not.

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