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| Section | Weight | Objectives |
|---|---|---|
| Managing Tables with DML | 5% | - Transaction management and control - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
| Retrieving and Sorting Data | 15% | - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Sorting query results - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Operator precedence rules - Using SELECT statement and column aliases |
| Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components - Relationship between database and SQL |
| DDL for Tables and Relationships | 15% | - Table structure, columns, data types - Constraints management - Views management - Drop columns, set unused columns - CREATE TABLE statement - TRUNCATE TABLE statement - Temporary and external tables |
| Controlling User Access | 5% | - Granting privileges on tables - Roles creation and privilege assignment - System vs object privileges |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Using Functions | 25% | - Restricting group results - ROUND, TRUNC, MOD functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Nested functions - Data type conversion: implicit and explicit - Date arithmetic and date functions - NVL, NULLIF, COALESCE functions - Group functions and grouping data - Character functions for string manipulation |
| Using SET Operators | 5% | - Using ORDER BY with set operations - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements |
>> Original 1Z1-171 Questions <<
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NEW QUESTION # 46
What is the difference between UNION and UNION ALL?
Answer: D
NEW QUESTION # 47
What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;
Answer: A
NEW QUESTION # 48
Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?
Answer: C
NEW QUESTION # 49
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: A
NEW QUESTION # 50
Which SQL function can be used to replace NULL values with a specified value?
Answer: A
NEW QUESTION # 51
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