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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Retrieving and Sorting Data | 15% | - Operators, literals, DISTINCT keyword - Sorting query results - Using SELECT statement and column aliases - Limiting rows and substitution variables - Arithmetic expressions and NULL values - Operator precedence rules - DEFINE and VERIFY commands |
| Topic 2: Using Functions | 25% | - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Restricting group results - NVL, NULLIF, COALESCE functions - Nested functions - Character functions for string manipulation - Date arithmetic and date functions - Group functions and grouping data - ROUND, TRUNC, MOD functions - Data type conversion: implicit and explicit |
| Topic 3: Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Topic 4: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 5: Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Topic 6: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Topic 7: Controlling User Access | 5% | - System vs object privileges - Granting privileges on tables - Roles creation and privilege assignment |
| Topic 8: DDL for Tables and Relationships | 15% | - Constraints management - Table structure, columns, data types - TRUNCATE TABLE statement - CREATE TABLE statement - Drop columns, set unused columns - Temporary and external tables - Views management |
| Topic 9: Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Topic 10: Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects - Relationship between database and SQL |
| Topic 11: Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
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NEW QUESTION # 53
Which command is used to add a new column to an existing table?
Answer: A
NEW QUESTION # 54
Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?
Answer: D
NEW QUESTION # 55
What is the default order of evaluation when multiple SET operators are used in a query?
Answer: C
NEW QUESTION # 56
What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;
Answer: A
NEW QUESTION # 57
How is the LOCALTIMESTAMP function different from CURRENT_TIMESTAMP?
Answer: C
NEW QUESTION # 58
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