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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: DDL for Tables and Relationships | 15% | - Constraints management - TRUNCATE TABLE statement - Views management - Drop columns, set unused columns - Table structure, columns, data types - CREATE TABLE statement - Temporary and external tables |
| Topic 2: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 3: Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Topic 4: Using Functions | 25% | - Date arithmetic and date functions - Restricting group results - Data type conversion: implicit and explicit - ROUND, TRUNC, MOD functions - Group functions and grouping data - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Character functions for string manipulation - NVL, NULLIF, COALESCE functions - Nested functions |
| Topic 5: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 6: Retrieving and Sorting Data | 15% | - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Sorting query results - Using SELECT statement and column aliases - Operator precedence rules - Operators, literals, DISTINCT keyword - DEFINE and VERIFY commands |
| Topic 7: Using SET Operators | 5% | - Matching SELECT statements - Using ORDER BY with set operations - UNION, UNION ALL, INTERSECT, MINUS operators |
| Topic 8: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Topic 9: Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
| Topic 10: Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Topic 11: Relational Database Concepts | 5% | - Relationship between database and SQL - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components |
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NEW QUESTION # 99
What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;
Answer: C
NEW QUESTION # 100
Which SQL clause can be used in Oracle to limit the number of rows returned?
Answer: C
NEW QUESTION # 101
Which of the following data dictionary views provides information about constraints on tables?
Answer: A
NEW QUESTION # 102
How are NULL values treated in relational databases?
Answer: D
NEW QUESTION # 103
How can a synonym benefit database design?
Answer: C
NEW QUESTION # 104
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