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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Operator precedence rules - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - Limiting rows and substitution variables - DEFINE and VERIFY commands - Sorting query results - Operators, literals, DISTINCT keyword |
| Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components - Relationship between database and SQL |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Temporary and external tables - Table structure, columns, data types - CREATE TABLE statement - TRUNCATE TABLE statement - Views management - Constraints management |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Using Functions | 25% | - Nested functions - NVL, NULLIF, COALESCE functions - ROUND, TRUNC, MOD functions - Data type conversion: implicit and explicit - Group functions and grouping data - Character functions for string manipulation - Restricting group results - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Date arithmetic and date functions |
| Controlling User Access | 5% | - Roles creation and privilege assignment - Granting privileges on tables - System vs object privileges |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage indexes - Create and manage sequences |
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NEW QUESTION # 44
What is a sequence in Oracle Database?
Answer: C
NEW QUESTION # 45
What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;
Answer: B
NEW QUESTION # 46
What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;
Answer: D
NEW QUESTION # 47
What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
Answer: D
NEW QUESTION # 48
Which SQL function calculates the number of months between two dates?
Response:
Answer: B
NEW QUESTION # 49
......
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