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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the purpose of a correlated subquery?

A) A subquery that can be used only with aggregate functions
B) A subquery that references columns from the outer query
C) A subquery that combines data from multiple tables
D) A subquery that depends on the result of another subquery

2. Which of the following is an example of an object privilege?

A) DROP DATABASE
B) ALTER USER
C) CREATE TABLE
D) SELECT ON table_name

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

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

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

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

5. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) NULL
B) 100
C) 200
D) 300

Solutions: