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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQLPlus command displays defined substitution variable values?

A) VERIFY
B) SHOW
C) LIST
D) DEFINE

2. What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;

A) All department IDs from the departments table
B) Department IDs that exist only in the employees table
C) Department IDs that exist in both the departments and employees tables
D) All department IDs from the employees table

3. What happens when a unique index is created on a table column?

A) The column data type is converted to a primary key.
B) The column values are automatically encrypted.
C) The column cannot contain duplicate values.
D) The column can only contain NULL values.

4. Which SQL keyword is used to remove duplicate rows from the result set of a query?

A) DISTINCTROW
B) UNIQUE
C) ONLY
D) DISTINCT

5. What does a Cartesian product in SQL result from?

A) An OUTER JOIN with NULL values
B) An INNER JOIN without specifying join conditions
C) A NATURAL JOIN without specifying join conditions

Solutions: