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| Section | Weight | Objectives |
|---|---|---|
| Relational Database Concepts | 5% | - Relationship between database and SQL - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Views management - Table structure, columns, data types - CREATE TABLE statement - Constraints management - TRUNCATE TABLE statement - Temporary and external tables |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Using Functions | 25% | - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Nested functions - Group functions and grouping data - Character functions for string manipulation - NVL, NULLIF, COALESCE functions - Date arithmetic and date functions - Data type conversion: implicit and explicit - Restricting group results - ROUND, TRUNC, MOD functions |
| Retrieving and Sorting Data | 15% | - Arithmetic expressions and NULL values - Using SELECT statement and column aliases - Limiting rows and substitution variables - Sorting query results - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Operator precedence rules |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Managing Tables with DML | 5% | - Transaction management and control - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations |
| Using SET Operators | 5% | - Using ORDER BY with set operations - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements |
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NEW QUESTION # 100
What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;
Answer: B
NEW QUESTION # 101
What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;
Answer: B
NEW QUESTION # 102
Which SQL clause is used to specify the source table in a query?
Answer: B
NEW QUESTION # 103
Which command can be used to rename a table in Oracle Database?
Answer: D
NEW QUESTION # 104
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: C
NEW QUESTION # 105
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