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| Section | Objectives |
|---|---|
| Relational Database and SQL Fundamentals | - Understanding relational database concepts - SQL language overview |
| Group Functions and Aggregation | - Aggregate functions (COUNT, SUM, AVG, MIN, MAX) - GROUP BY clause - HAVING clause |
| Data Retrieval Using SQL | - Sorting results with ORDER BY - Filtering data with WHERE clause - SELECT statements |
| Joins and Subqueries | - Equijoins and non-equijoins - Outer joins - Subqueries (single-row and multi-row) |
| Advanced SQL Concepts | - Set operators (UNION, INTERSECT, MINUS) - Pseudocolumns and expressions |
| Data Manipulation and Schema Objects | - CREATE, ALTER, DROP statements - Constraints and integrity rules - INSERT, UPDATE, DELETE statements |
| Single-Row Functions | - Number functions - Date functions - Conversion functions - Character functions |
1. The CUSTOMERS table has these columns:
Which statement finds the rows in the CUSTOMERS table that do not have a postal code?
A) SELECT customer_id, customer_name FROM customers WHERE postal_code IS NULL;
B) SELECT customer_id, customer_name FROM customers WHERE postal_code = NULL;
C) SELECT customer_id, customer_name FROM customers WHERE postal_code = '________';
D) SELECT customer_id, customer_name FROM customers WHERE postal_code CONTAINS NULL;
E) SELECT customer_id, customer_name FROM customers WHERE postal code IS NVL;
2. Which constraint can be defined only at the column level?
A) CHECK
B) PRIMARY KEY
C) NOT NULL
D) UNIQUE
E) FOREIGN KEY
3. The user Alice wants to grant all users query privileges on her DEPT table. Which SQL statement accomplishes this?
A) GRANT select ON dept TO ALL;
B) GRANT QUERY ON dept TO ALL_USERS
C) GRANT select ON dept TO PUBLIC;
D) GRANT select ON dept TO ALL_USERS;
4. The EMP table has these columns:
Management wants a list of names of employees who have been with the company for more than five years. Which SQL statement displays the required results?
A) SELECT ENAME FROM EMP WHERE SYSDATE-HIRE_DATE > 5;
B) SELECT ENAME FROM EMP WHERE (SYSDATE-HIRE_DATE)/365 > 5;
C) SELECT ENAME FROM EMP WHERE (SYSDATE-HIRE_DATE)* 365 > 5;
D) SELECT ENAME FROM EMP WHERE HIRE_DATE-SYSDATE > 5;
5. Which clause should you use to exclude group results?
A) WHERE
B) HAVING
C) RESTRICT
D) ORDER BY
E) GROUP BY
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: C | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: B |
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