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Oracle Database 23ai SQL Associate Sample Questions:

1. What is a subquery in SQL?

A) A query that combines data from multiple tables
B) A query inside another query
C) A query used to create a table
D) A query used for joining two or more tables

2. Which function returns the current system date and time in the database session's time zone?

A) SYSDATE
B) CURRENT_TIMESTAMP
C) LOCAL_TIME
D) SYSTEM_TIME

3. Which clause is used to ensure that only specific rows are deleted in a DELETE statement?

A) SET
B) FROM
C) HAVING
D) WHERE

4. Which command creates a new role in Oracle Database?

A) CREATE ROLE role_name;
B) CREATE NEW ROLE role_name;
C) ADD ROLE role_name;

5. Which of the following is true about foreign key constraints in SQL?

A) They ensure that a column only contains NULL values.
B) They define a relationship between two tables.
C) They enforce the uniqueness of values in a column.

Solutions: