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Oracle Database 23ai SQL Associate Sample Questions:

1. Which type of join includes rows that do not have matching values in the joined table?

A) OUTER JOIN
B) SELF JOIN
C) CROSS JOIN
D) INNER JOIN

2. Which of the following SET operators combines results from two queries and removes duplicates?

A) UNION
B) MINUS
C) INTERSECT
D) UNION ALL

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

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

4. Which of the following is a valid reason to create a synonym?

A) To provide simplified and consistent access to an object
B) To enforce unique constraints on a table
C) To automatically generate numeric values for a column
D) To improve query performance

5. What is required for the queries combined by a SET operator to work correctly?

A) The tables must be joined using a primary key.
B) The result sets must have the same number of columns and compatible data types.
C) Both queries must include the WHERE clause.
D) Both queries must use the GROUP BY clause.

Solutions: