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| Section | Weight | Objectives |
|---|---|---|
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage indexes - Create and manage sequences |
| DDL for Tables and Relationships | 15% | - Views management - Drop columns, set unused columns - Table structure, columns, data types - Temporary and external tables - TRUNCATE TABLE statement - Constraints management - CREATE TABLE statement |
| Retrieving and Sorting Data | 15% | - Operators, literals, DISTINCT keyword - Limiting rows and substitution variables - DEFINE and VERIFY commands - Using SELECT statement and column aliases - Sorting query results - Arithmetic expressions and NULL values - Operator precedence rules |
| Using SET Operators | 5% | - Using ORDER BY with set operations - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
| Using Functions | 25% | - Nested functions - Character functions for string manipulation - Restricting group results - Group functions and grouping data - Date arithmetic and date functions - NVL, NULLIF, COALESCE functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Data type conversion: implicit and explicit - ROUND, TRUNC, MOD functions |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relationship between database and SQL - Relational database theoretical and physical aspects |
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NEW QUESTION # 61
What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;
Answer: B
NEW QUESTION # 62
What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;
Answer: A
NEW QUESTION # 63
What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;
Answer: B
NEW QUESTION # 64
What is the purpose of using external tables in Oracle Database?
Answer: A
NEW QUESTION # 65
What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
Answer: B
NEW QUESTION # 66
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