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| Section | Weight | Objectives |
|---|---|---|
| DDL for Tables and Relationships | 15% | - Views management - Table structure, columns, data types - TRUNCATE TABLE statement - Temporary and external tables - Constraints management - CREATE TABLE statement - Drop columns, set unused columns |
| Retrieving and Sorting Data | 15% | - DEFINE and VERIFY commands - Limiting rows and substitution variables - Sorting query results - Operators, literals, DISTINCT keyword - Operator precedence rules - Arithmetic expressions and NULL values - Using SELECT statement and column aliases |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Using Functions | 25% | - Nested functions - ROUND, TRUNC, MOD functions - Group functions and grouping data - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - NVL, NULLIF, COALESCE functions - Character functions for string manipulation - Restricting group results - Data type conversion: implicit and explicit - Date arithmetic and date functions |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage sequences - Create and manage synonyms |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - Transaction management and control - INSERT, UPDATE, DELETE operations |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relationship between database and SQL - Relational database theoretical and physical aspects |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
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NEW QUESTION # 12
Which SQL clause can be used in Oracle to limit the number of rows returned?
Answer: A
NEW QUESTION # 13
What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);
Answer: D
NEW QUESTION # 14
Which of the following ensures that a relational database enforces data integrity?
Answer: A
NEW QUESTION # 15
Which of the following SQL commands retrieves data from a relational database?
Answer: C
NEW QUESTION # 16
Which type of privilege allows a user to perform administrative tasks, such as creating other users?
Answer: B
NEW QUESTION # 17
......
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