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| Section | Weight | Objectives |
|---|---|---|
| Using Functions | 25% | - ROUND, TRUNC, MOD functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - NVL, NULLIF, COALESCE functions - Nested functions - Character functions for string manipulation - Restricting group results - Group functions and grouping data - Date arithmetic and date functions - Data type conversion: implicit and explicit |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects - Relationship between database and SQL |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage synonyms - Create and manage indexes |
| DDL for Tables and Relationships | 15% | - TRUNCATE TABLE statement - Views management - Table structure, columns, data types - CREATE TABLE statement - Temporary and external tables - Drop columns, set unused columns - Constraints management |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations - Transaction management and control |
| Retrieving and Sorting Data | 15% | - Arithmetic expressions and NULL values - DEFINE and VERIFY commands - Using SELECT statement and column aliases - Operators, literals, DISTINCT keyword - Sorting query results - Limiting rows and substitution variables - Operator precedence rules |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Controlling User Access | 5% | - Granting privileges on tables - Roles creation and privilege assignment - System vs object privileges |
| Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views - INTERVAL data types |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
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NEW QUESTION # 49
What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;
Answer: B
NEW QUESTION # 50
Which SET operator returns rows from the first query that are not present in the second query?
Answer: D
NEW QUESTION # 51
How are NULL values treated in relational databases?
Answer: A
NEW QUESTION # 52
Which type of join returns all rows from the left table, even if there are no matches in the right table?
Answer: C
NEW QUESTION # 53
Which statement can be used to undo changes made in a transaction?
Answer: D
NEW QUESTION # 54
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