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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Topic 2: Relational Database Concepts | 5% | - Relationship between database and SQL - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components |
| Topic 3: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
| Topic 4: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 5: Retrieving and Sorting Data | 15% | - Using SELECT statement and column aliases - Sorting query results - Limiting rows and substitution variables - Operator precedence rules - Operators, literals, DISTINCT keyword - DEFINE and VERIFY commands - Arithmetic expressions and NULL values |
| Topic 6: Using Functions | 25% | - Group functions and grouping data - Data type conversion: implicit and explicit - NVL, NULLIF, COALESCE functions - Nested functions - Date arithmetic and date functions - ROUND, TRUNC, MOD functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Restricting group results - Character functions for string manipulation |
| Topic 7: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 8: DDL for Tables and Relationships | 15% | - Constraints management - Drop columns, set unused columns - CREATE TABLE statement - Views management - Temporary and external tables - Table structure, columns, data types - TRUNCATE TABLE statement |
| Topic 9: Data Dictionary and Time Zones | 5% | - INTERVAL data types - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Topic 10: Managing Tables with DML | 5% | - Transaction management and control - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements |
| Topic 11: Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
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NEW QUESTION # 70
In a relational database, what is a foreign key?
Answer: B
NEW QUESTION # 71
What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
Answer: C
NEW QUESTION # 72
What will the following query do?
DELETE FROM employees
WHERE department_id = 20;
Answer: A
NEW QUESTION # 73
Which type of join includes rows that do not have matching values in the joined table?
Answer: B
NEW QUESTION # 74
Which of the following ensures that a relational database enforces data integrity?
Answer: D
NEW QUESTION # 75
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