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Oracle Database 23ai SQL Associate Sample Questions:

1. How are NULL values treated in relational databases?

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

2. What is a SELF JOIN in SQL?

A) A join that does not require a WHERE clause
B) A join of a table with itself
C) A join used for Cartesian products
D) A join between tables with identical structures

3. Which SQL clause is used to specify the source table in a query?

A) GROUP BY
B) WHERE
C) SELECT
D) FROM

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

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

5. What happens when a temporary table is created in Oracle Database?

A) It is created for the duration of a user session or transaction.
B) It is permanently stored in the database.
C) It cannot have any constraints.
D) It is stored in external files.

Solutions: