Computer Information Systems

Step 1: 7. Which of the following is true in the context of relational databases? Correct Answer: Columns in tables represent the objects' fields Explanation: In a relational database, columns (or attributes) represent the fields of an object, and rows (or records) represent instances of those objects. Step 2: 8. Which one of the following SQL statements displays the name of all the viruses listed in the table below? Correct Answer: SELECT name FROM virus; Explanation: To display only the name of the viruses, you use the SELECT statement specifying the name column from the virus table. Step 3: 9. Which of the following SQL statements retrieves all books priced more than £25 from the myBookshop database you created in the lab? Correct Answer: SELECT name, price FROM books WHERE price > 25; Explanation: To retrieve all books priced more than £25, you need to specify the condition price>25 in the WHERE clause. Step 4: 10. Which of the following SQL statements will display fields that have been defined in a table? Correct Answer: DESCRIBE TableName; Explanation: The DESCRIBE statement is used to display the structure of a table, including its fields and their types. Step 5: 11. Which one of the following pairs is the best choice to complete this sentence? In a relational database, each type of ... is represented by a ... Correct Answer: entity, table Explanation: In a relational database, each type of entity (such as a person, place, or thing) is represented by a table, and each instance of that entity is represented by a row in the table. FINAL ANSWER Columns in tables represent the objects' fields SELECT name FROM virus; SELECT name, price FROM books WHERE price > 25; DESCRIBE TableName; entity, table

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