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| Section | Weight | Objectives |
|---|---|---|
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects - Relationship between database and SQL |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Retrieving and Sorting Data | 15% | - Sorting query results - Using SELECT statement and column aliases - Operator precedence rules - Arithmetic expressions and NULL values - Limiting rows and substitution variables - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword |
| Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types - Using data dictionary views |
| DDL for Tables and Relationships | 15% | - TRUNCATE TABLE statement - Temporary and external tables - Constraints management - CREATE TABLE statement - Drop columns, set unused columns - Table structure, columns, data types - Views management |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Using Functions | 25% | - Character functions for string manipulation - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Restricting group results - Date arithmetic and date functions - Nested functions - Group functions and grouping data - NVL, NULLIF, COALESCE functions - Data type conversion: implicit and explicit - ROUND, TRUNC, MOD functions |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage indexes - Create and manage sequences |
| Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
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NEW QUESTION # 16
What does the following query return?
SELECT employee_id
FROM employees
WHERE department_id IN (SELECT department_id FROM departments WHERE location_id = 1000);
Answer: C
NEW QUESTION # 17
Which type of join includes rows that do not have matching values in the joined table?
Answer: C
NEW QUESTION # 18
What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;
Answer: B
NEW QUESTION # 19
Which data dictionary view provides information about all tables accessible to the current user?
Answer: D
NEW QUESTION # 20
What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
Answer: D
NEW QUESTION # 21
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