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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 2: Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements - Using ORDER BY with set operations |
| Topic 3: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 4: Retrieving and Sorting Data | 15% | - Arithmetic expressions and NULL values - Operators, literals, DISTINCT keyword - DEFINE and VERIFY commands - Limiting rows and substitution variables - Sorting query results - Operator precedence rules - Using SELECT statement and column aliases |
| Topic 5: Using Functions | 25% | - ROUND, TRUNC, MOD functions - Group functions and grouping data - Restricting group results - Nested functions - Data type conversion: implicit and explicit - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Date arithmetic and date functions - Character functions for string manipulation - NVL, NULLIF, COALESCE functions |
| Topic 6: DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Constraints management - Table structure, columns, data types - CREATE TABLE statement - TRUNCATE TABLE statement - Temporary and external tables - Views management |
| Topic 7: Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Topic 8: Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types - Using data dictionary views |
| Topic 9: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage indexes - Create and manage synonyms |
| Topic 10: Relational Database Concepts | 5% | - Relationship between database and SQL - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components |
| Topic 11: Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations - Transaction management and control |
Which of the following statements is true about constraints in Oracle Database?
Correct Answer: B 🗳️
What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);
Correct Answer: C 🗳️
What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);
Correct Answer: C 🗳️
What is the difference between UNION and UNION ALL?
Correct Answer: B 🗳️
What is the default order of evaluation when multiple SET operators are used in a query?
Correct Answer: B 🗳️
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