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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using Functions | 25% | - Nested functions - Data type conversion: implicit and explicit - Restricting group results - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - NVL, NULLIF, COALESCE functions - Date arithmetic and date functions - ROUND, TRUNC, MOD functions - Group functions and grouping data - Character functions for string manipulation |
| Topic 2: Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Topic 3: Retrieving and Sorting Data | 15% | - Sorting query results - Using SELECT statement and column aliases - DEFINE and VERIFY commands - Arithmetic expressions and NULL values - Operators, literals, DISTINCT keyword - Limiting rows and substitution variables - Operator precedence rules |
| Topic 4: DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Table structure, columns, data types - TRUNCATE TABLE statement - Constraints management - CREATE TABLE statement - Views management - Temporary and external tables |
| Topic 5: Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Topic 6: Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Topic 7: Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components - Relationship between database and SQL |
| Topic 8: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage indexes - Create and manage synonyms |
| Topic 9: Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements - Using ORDER BY with set operations |
| Topic 10: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 11: Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
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NEW QUESTION # 73
What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;
Answer: A
NEW QUESTION # 74
What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;
Answer: C
NEW QUESTION # 75
Which clause in a SQL SELECT statement is used to define the columns to be retrieved?
Answer: A
NEW QUESTION # 76
How are NULL values treated in relational databases?
Answer: C
NEW QUESTION # 77
What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;
Answer: B
NEW QUESTION # 78
......
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