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Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following ensures that a relational database enforces data integrity?

A) Constraints such as primary keys, foreign keys, and unique constraints
B) Hierarchical data organization
C) Indexes on all columns
D) Redundant data storage

2. 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.

3. 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) Both queries must use the GROUP BY clause.
C) Both queries must include the WHERE clause.
D) The result sets must have the same number of columns and compatible data types.

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

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

5. Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?

A) Rectangles
B) Ovals
C) Diamonds
D) Arrows

Solutions: