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| Section | Weight | Objectives |
|---|---|---|
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - CREATE TABLE statement - Temporary and external tables - TRUNCATE TABLE statement - Table structure, columns, data types - Constraints management - Views management |
| Controlling User Access | 5% | - Roles creation and privilege assignment - Granting privileges on tables - System vs object privileges |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage sequences - Create and manage synonyms |
| Using Functions | 25% | - Restricting group results - Date arithmetic and date functions - Nested functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Character functions for string manipulation - Group functions and grouping data - Data type conversion: implicit and explicit - ROUND, TRUNC, MOD functions - NVL, NULLIF, COALESCE functions |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Transaction management and control - Multi-table INSERT and MERGE statements |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relationship between database and SQL - Relational database theoretical and physical aspects |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Retrieving and Sorting Data | 15% | - Sorting query results - DEFINE and VERIFY commands - Using SELECT statement and column aliases - Limiting rows and substitution variables - Arithmetic expressions and NULL values - Operators, literals, DISTINCT keyword - Operator precedence rules |
What is the difference between UNION and UNION ALL?
Correct Answer: B 🗳️
Which of the following data dictionary views provides information about constraints on tables?
Correct Answer: B 🗳️
What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;
Correct Answer: B 🗳️
Which of the following is a valid reason to create a synonym?
Correct Answer: C 🗳️
Which INTERVAL data type would you use to store a period of time in years and months?
Correct Answer: B 🗳️
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