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| Section | Weight | Objectives |
|---|---|---|
| Using SET Operators | 5% | - Using ORDER BY with set operations - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements |
| Using Functions | 25% | - Nested functions - Restricting group results - Date arithmetic and date functions - ROUND, TRUNC, MOD functions - Data type conversion: implicit and explicit - Group functions and grouping data - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - NVL, NULLIF, COALESCE functions - Character functions for string manipulation |
| Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Table structure, columns, data types - Views management - Temporary and external tables - TRUNCATE TABLE statement - CREATE TABLE statement - Constraints management |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Transaction management and control - Multi-table INSERT and MERGE statements |
| Controlling User Access | 5% | - Granting privileges on tables - Roles creation and privilege assignment - System vs object privileges |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
| Retrieving and Sorting Data | 15% | - Sorting query results - Operators, literals, DISTINCT keyword - Limiting rows and substitution variables - Operator precedence rules - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - DEFINE and VERIFY commands |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
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NEW QUESTION # 13
Which data dictionary view provides information about all the columns in tables accessible to the current user?
Answer: B
NEW QUESTION # 14
What is a SELF JOIN in SQL?
Answer: D
NEW QUESTION # 15
What does a Cartesian product in SQL result from?
Answer: A
NEW QUESTION # 16
What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);
Answer: A
NEW QUESTION # 17
Which of the following data dictionary views provides information about constraints on tables?
Answer: B
NEW QUESTION # 18
......
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