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Oracle Database 23ai SQL Associate Sample Questions:

1. Which type of join retrieves only the rows with matching values in both tables?

A) INNER JOIN
B) NATURAL JOIN
C) OUTER JOIN
D) CROSS JOIN

2. What is the difference between UNION and UNION ALL?

A) UNION combines columns, while UNION ALL combines rows.
B) UNION includes all rows, while UNION ALL removes duplicates.
C) UNION works with subqueries, while UNION ALL does not.
D) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.

3. Which operator can be used in a multiple-row subquery to match a single value to a list of values?

A) EXISTS
B) =
C) IN
D) NOT NULL

4. Which SQL clause is used to specify the source table in a query?

A) FROM
B) GROUP BY
C) SELECT
D) WHERE

5. Which of the following statements is true about constraints in Oracle Database?

A) Constraints are automatically dropped when rows are deleted.
B) Constraints cannot reference other tables.
C) Constraints can only be added when creating a table.
D) Constraints can be added or modified using the ALTER TABLE statement.

Solutions: