Question 10Which of the following is true about FULL OUTER JOIN created on two tables Table 1 and Table 2?1 pointRetrieves only matched rows of Table 1 and Table 2Retrieves the unmatched rows of Table 2Retrieves both matched and unmatched rows of Table 1 and Table 2Retrieves all the unmatched rows of Table 1
Question
Question 10Which of the following is true about FULL OUTER JOIN created on two tables Table 1 and Table 2?1 pointRetrieves only matched rows of Table 1 and Table 2Retrieves the unmatched rows of Table 2Retrieves both matched and unmatched rows of Table 1 and Table 2Retrieves all the unmatched rows of Table 1
Solution
The correct answer is: Retrieves both matched and unmatched rows of Table 1 and Table 2.
Here's why:
A FULL OUTER JOIN in SQL is a combination of LEFT and RIGHT JOIN. It returns all the rows from both tables, matching records from both sides where available. If there is no match, the result is NULL on either side.
So, it retrieves both matched (where a common value exists in both tables) and unmatched rows (where a common value does not exist) from Table 1 and Table 2.
The other options are partially correct but they do not fully describe the functionality of a FULL OUTER JOIN.
Similar Questions
What happens to unmatched rows with the full outer join operator?1 pointAll unmatched rows are removed from the result of a full outer join operation. Unmatched rows from both tables are retained in the result of a full outer join operation.Unmatched rows from only one table are retained in the result of a full outer join operation. Unmatched rows are randomly retained in the result of a full outer join operation.
Which JOIN returns only the matching rows from both tables? 1 pointINNER JOINLEFT JOINRIGHT JOINFULL OUTER JOIN
In which cases would you use an outer join?Select one:a.The tables being joined have only matched data.b.Only when the tables have a primary key/foreign key relationship.c.The tables being joined have only unmatched data.d.The tables being joined have both matched and unmatched data.e.The tables being joined have NOT NULL columns.
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Question 1Which of this type of join returns an output of only matching records in the two tables? (Select all that apply)1 pointFULL JOINJOININNER JOINLEFT JOIN
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