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Oracle 1Z1-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What is the primary purpose of an index in SQL?

A) To enforce data integrity constraints
B) To ensure uniqueness of values in a column
C) To improve the performance of data retrieval queries
D) To store metadata about a table

3. Which of the following can be achieved using a correlated subquery?

A) Comparing each employee's salary to the average salary of their department
B) Joining two tables without a common column
C) Inserting data into a table
D) Retrieving duplicate records from a single table

4. Which clause in an UPDATE statement typically uses a subquery to assign values to columns?

A) FROM
B) SET
C) WHERE
D) HAVING

5. What is the purpose of the MERGE statement in SQL?

A) To delete duplicate rows from a table
B) To combine the results of two queries
C) To update existing rows or insert new rows in a target table
D) To join two tables into one

Solutions: