Advanced SQL problems
- 1. Which of the following is true concerning triggers?
Options- A. You do not create them with SQL.
- B. They execute against only some applications that access a database.
- C. They have an event, condition, and action.
- D. They cannot cascade (cause another trigger to fire). Discuss
Correct Answer: They have an event, condition, and action.
- 2. What type of join is needed when you wish to include rows that do not have matching values?
Options- A. Equi-join
- B. Natural join
- C. Outer join
- D. All of the above. Discuss
Correct Answer: Outer join
- 3. What type of join is needed when you wish to return rows that do have matching values?
Options- A. Equi-join
- B. Natural join
- C. Outer join
- D. All of the above. Discuss
Correct Answer: All of the above.
- 4. Embedded SQL is which of the following?
Options- A. Hard-coded SQL statements in a program language such as Java.
- B. The process of making an application capable of generating specific SQL code on the fly.
- C. Hard-coded SQL statements in a procedure.
- D. Hard-coded SQL statements in a trigger. Discuss
Correct Answer: Hard-coded SQL statements in a program language such as Java.
- 5. Which of the following statements is true concerning subqueries?
Options- A. Involves the use of an inner and outer query.
- B. Cannot return the same result as a query that is not a subquery.
- C. Does not start with the word SELECT.
- D. All of the above. Discuss
Correct Answer: Involves the use of an inner and outer query.
- 6. The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T WHERE CUSTOMER_T. CUSTOMER_ID = ORDER_T. CUSTOMER_ID
Options- A. Equi-join
- B. Natural join
- C. Outer join
- D. Cartesian join Discuss
Correct Answer: Equi-join
- 7. A UNION query is which of the following?
Options- A. Combines the output from no more than two queries and must include the same number of columns.
- B. Combines the output from no more than two queries and does not include the same number of columns.
- C. Combines the output from multiple queries and must include the same number of columns.
- D. Combines the output from multiple queries and does not include the same number of columns. Discuss
Correct Answer: Combines the output from multiple queries and must include the same number of columns.
- 8. Which of the following is one of the basic approaches for joining tables?
Options- A. Subqueries
- B. Union Join
- C. Natural join
- D. All of the above Discuss
Correct Answer: All of the above
- 9. Which of the following is true concerning a procedure?
Options- A. You do not create them with SQL.
- B. They do not need to have a unique name.
- C. They include procedural and SQL statements.
- D. They are the same thing as a function. Discuss
Correct Answer: They include procedural and SQL statements.
- 10. Which of the following is true concerning systems information in an RDBMS?
Options- A. RDBMS store database definition information in system-created tables.
- B. This information can be accessed using SQL.
- C. This information often cannot be updated by a user.
- D. All of the above. Discuss
Correct Answer: All of the above.
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