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Oracle 1Z0-171 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 ensure that a column only contains NULL values.
B) They enforce the uniqueness of values in a column.
C) They define a relationship between two tables.

2. Which data dictionary view provides information about all the columns in tables accessible to the current user?

A) DBA_TAB_COLUMNS
B) ALL of the above
C) USER_COLUMNS
D) ALL_TAB_COLUMNS

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

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

4. What does the NEXTVAL pseudocolumn do in SQL?

A) Deletes the sequence from the database
B) Resets the sequence to its starting value
C) Retrieves the next value in a sequence and increments the sequence
D) Retrieves the current value of a sequence without incrementing it

5. What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;

A) Employee IDs and their annual salaries
B) Only employees with salaries greater than 12
C) Salaries multiplied by 12 and stored in a new table
D) Monthly salaries of all employees

Solutions: