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| Section | Weight | Objectives |
|---|---|---|
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Constraints management - Views management - Table structure, columns, data types - Temporary and external tables - TRUNCATE TABLE statement - CREATE TABLE statement |
| Retrieving and Sorting Data | 15% | - Sorting query results - Operator precedence rules - Using SELECT statement and column aliases - DEFINE and VERIFY commands - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Operators, literals, DISTINCT keyword |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Using Functions | 25% | - NVL, NULLIF, COALESCE functions - Nested functions - Group functions and grouping data - Character functions for string manipulation - Restricting group results - ROUND, TRUNC, MOD functions - Data type conversion: implicit and explicit - Date arithmetic and date functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| 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% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage indexes - Create and manage synonyms |
| Controlling User Access | 5% | - Granting privileges on tables - System vs object privileges - Roles creation and privilege assignment |
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NEW QUESTION # 25
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 # 26
What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;
Answer: B
NEW QUESTION # 27
What is the purpose of the SAVEPOINT statement?
Answer: C
NEW QUESTION # 28
Which Oracle SQL function returns the current date and time, including time zone information?
Answer: B
NEW QUESTION # 29
What is the purpose of the MERGE statement in SQL?
Answer: C
NEW QUESTION # 30
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