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Which SQL function is used to return the number of rows that match a specific condition?
A. COUNT()
B. SUM()
C. AVG()
D. MAX()
Answer: COUNT()
Which SQL keyword is used to combine the result set of two or more SELECT queries?
A. UNION
B. INTERSECT
C. MERGE
D. JOIN
Answer: UNION
Which of the following SQL constraints ensures that all values in a column are unique?
A. UNIQUE
B. NOT NULL
C. DEFAULT
D. PRIMARY KEY
Answer: UNIQUE
In relational databases, which of the following best describes a ‘view’?
A. A virtual table based on the result set of a SQL query
B. A table that holds only metadata
C. A permanent table that stores historical data
D. A special type of index
Answer: A virtual table based on the result set of a SQL query
Which of the following is a type of relationship between database tables?
A. One-to-many
B. One-to-zero
C. Two-to-two
D. Four-to-five
Answer: One-to-many
What does the acronym ‘ACID’ stand for in database transactions?
A. Atomicity, Consistency, Isolation, Durability
B. Association, Consistency, Integrity, Data
C. Accuracy, Control, Isolation, Durability
D. Association, Connection, Integration, Deletion
Answer: Atomicity, Consistency, Isolation, Durability
Which of the following SQL functions is used to return the largest value from a set of values?
A. MAX()
B. MIN()
C. SUM()
D. AVG()
Answer: MAX()
What is the purpose of a ‘checkpoint’ in a database?
A. To save the current state of the database and ensure durability
B. To recover lost data after a failure
C. To improve the speed of data retrieval
D. To normalize data in a database
Answer: To save the current state of the database and ensure durability
Which of the following commands is used to add new data into a table?
A. INSERT INTO
B. ADD DATA
C. UPDATE
D. APPEND
Answer: INSERT INTO