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| Section | Weight | Objectives |
|---|---|---|
| DDL for Tables and Relationships | 15% | - Temporary and external tables - CREATE TABLE statement - TRUNCATE TABLE statement - Views management - Constraints management - Table structure, columns, data types - Drop columns, set unused columns |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects - Relationship between database and SQL |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage sequences - Create and manage synonyms |
| Using Functions | 25% | - NVL, NULLIF, COALESCE functions - Date arithmetic and date functions - Nested functions - Group functions and grouping data - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - ROUND, TRUNC, MOD functions - Character functions for string manipulation - Restricting group results - Data type conversion: implicit and explicit |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Retrieving and Sorting Data | 15% | - DEFINE and VERIFY commands - Arithmetic expressions and NULL values - Operator precedence rules - Sorting query results - Operators, literals, DISTINCT keyword - Using SELECT statement and column aliases - Limiting rows and substitution variables |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Controlling User Access | 5% | - Granting privileges on tables - Roles creation and privilege assignment - System vs object privileges |
| 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 # 42
What does the INTERSECT operator do in SQL?
Answer: C
NEW QUESTION # 43
What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;
Answer: A
NEW QUESTION # 44
What is the purpose of the DBA_OBJECTS data dictionary view?
Answer: B
NEW QUESTION # 45
Which of the following is true about foreign key constraints in SQL?
Answer: B
NEW QUESTION # 46
What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
Answer: D
NEW QUESTION # 47
......
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