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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Sorting query results - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Using SELECT statement and column aliases - Operators, literals, DISTINCT keyword - DEFINE and VERIFY commands - Operator precedence rules |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements - Using ORDER BY with set operations |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| DDL for Tables and Relationships | 15% | - TRUNCATE TABLE statement - Drop columns, set unused columns - Views management - Temporary and external tables - CREATE TABLE statement - Table structure, columns, data types - Constraints management |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - Relationship between database and SQL - SQL SELECT clauses and ERD components |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Using Functions | 25% | - ROUND, TRUNC, MOD functions - NVL, NULLIF, COALESCE functions - Nested functions - Restricting group results - Group functions and grouping data - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Data type conversion: implicit and explicit - Character functions for string manipulation - Date arithmetic and date functions |
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NEW QUESTION # 52
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 # 53
Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?
Answer: B
NEW QUESTION # 54
Which SQL keyword is used to remove duplicate rows from the result set of a query?
Answer: A
NEW QUESTION # 55
Which function returns the current system date and time in the database session's time zone?
Answer: C
NEW QUESTION # 56
Which command creates a new role in Oracle Database?
Answer: C
NEW QUESTION # 57
......
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