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Oracle 1Z1-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following is true about foreign key constraints in SQL?

A) They define a relationship between two tables.
B) They ensure that a column only contains NULL values.
C) They enforce the uniqueness of values in a column.

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

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

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

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

4. How does SQL handle NULL values in arithmetic expressions?

A) Treats them as zero
B) Produces an error
C) Produces a NULL result
D) Treats them as the largest possible number

5. Which SQL function converts a string representation of a date into a date data type?

A) CAST_TO_DATE
B) CONVERT_TO_DATE
C) DATE_CONVERT
D) TO_DATE

Solutions: