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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);

A) Creates a table with only VARCHAR2 and DATE columns
B) Creates a temporary table
C) Creates a table with a primary key and a NOT NULL constraint
D) Creates a table with no constraints

2. What is the primary purpose of an index in SQL?

A) To store metadata about a table
B) To improve the performance of data retrieval queries
C) To ensure uniqueness of values in a column
D) To enforce data integrity constraints

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

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

4. Which command revokes a user's privilege to update a table?

A) REVOKE UPDATE ON table_name FROM user_name;
B) REMOVE UPDATE ON table_name FROM user_name;
C) DELETE UPDATE ON table_name FROM user_name;
D) DENY UPDATE ON table_name FROM user_name;

5. What happens if a DELETE statement is executed without a WHERE clause?

A) No rows are deleted.
B) Only the first row is deleted.
C) All rows in the table are deleted.
D) An error is raised.

Solutions: