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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Sorting query results - DEFINE and VERIFY commands - Operator precedence rules - Operators, literals, DISTINCT keyword - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Using SELECT statement and column aliases |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Using Functions | 25% | - Group functions and grouping data - NVL, NULLIF, COALESCE functions - Restricting group results - Nested functions - Character functions for string manipulation - Date arithmetic and date functions - ROUND, TRUNC, MOD functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Data type conversion: implicit and explicit |
| Controlling User Access | 5% | - System vs object privileges - Granting privileges on tables - Roles creation and privilege assignment |
| DDL for Tables and Relationships | 15% | - Table structure, columns, data types - Drop columns, set unused columns - CREATE TABLE statement - Constraints management - TRUNCATE TABLE statement - Views management - Temporary and external tables |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Using SET Operators | 5% | - Using ORDER BY with set operations - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relationship between database and SQL - Relational database theoretical and physical aspects |
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NEW QUESTION # 103
The column data type is converted to a primary key.
Answer: C
NEW QUESTION # 104
What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;
Answer: C
NEW QUESTION # 105
Which of the following SQL commands retrieves data from a relational database?
Answer: B
NEW QUESTION # 106
What happens when the maximum value of a sequence is reached?
Answer: C
NEW QUESTION # 107
What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;
Answer: A
NEW QUESTION # 108
......
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