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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) CROSS JOIN
C) INNER JOIN
D) SELF JOIN

2. Which type of subquery returns exactly one value?

A) Multiple-row subquery
B) Inline view
C) Scalar subquery
D) Correlated subquery

3. How are NULL values treated in relational databases?

A) NULL values are not allowed in relational databases.
B) NULL values represent missing or unknown data.
C) NULL values are treated as zero.
D) NULL values are treated as empty strings.

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

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

5. Which of the following data dictionary views provides information about constraints on tables?

A) USER_CONSTRAINTS
B) ALL_CONSTRAINTS
C) DBA_CONSTRAINTS
D) All of the above

Solutions: