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Oracle Database 23ai SQL Associate Sample Questions:

1. Which command is used to add a new column to an existing table?

A) ADD COLUMN
B) ALTER COLUMN
C) ALTER TABLE
D) MODIFY COLUMN

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

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

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

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

4. What is the purpose of the DBA_OBJECTS data dictionary view?

A) To monitor system performance
B) To show the current session details
C) To list all users in the database
D) To provide information about all objects in the database

5. Which operator can be used in a multiple-row subquery to match a single value to a list of values?

A) IN
B) EXISTS
C) NOT NULL
D) =

Solutions: