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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Controlling User Access | 5% | - Granting privileges on tables - System vs object privileges - Roles creation and privilege assignment |
| Topic 2: Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Topic 3: Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
| Topic 4: Using Functions | 25% | - Restricting group results - Date arithmetic and date functions - NVL, NULLIF, COALESCE functions - Group functions and grouping data - ROUND, TRUNC, MOD functions - Nested functions - Data type conversion: implicit and explicit - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Character functions for string manipulation |
| Topic 5: Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Topic 6: DDL for Tables and Relationships | 15% | - Views management - CREATE TABLE statement - Temporary and external tables - Table structure, columns, data types - Drop columns, set unused columns - Constraints management - TRUNCATE TABLE statement |
| Topic 7: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage sequences - Create and manage synonyms |
| Topic 8: Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements - Using ORDER BY with set operations |
| Topic 9: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 10: Retrieving and Sorting Data | 15% | - Arithmetic expressions and NULL values - DEFINE and VERIFY commands - Limiting rows and substitution variables - Sorting query results - Operator precedence rules - Using SELECT statement and column aliases - Operators, literals, DISTINCT keyword |
| Topic 11: Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
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NEW QUESTION # 43
What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;
Answer: D
NEW QUESTION # 44
What is a subquery in SQL?
Answer: A
NEW QUESTION # 45
What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
Answer: C
NEW QUESTION # 46
Which type of join includes rows that do not have matching values in the joined table?
Answer: C
NEW QUESTION # 47
What is a SELF JOIN in SQL?
Answer: A
NEW QUESTION # 48
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