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| Section | Weight | Objectives |
|---|---|---|
| DDL for Tables and Relationships | 15% | - Views management - Constraints management - Drop columns, set unused columns - TRUNCATE TABLE statement - Temporary and external tables - Table structure, columns, data types - CREATE TABLE statement |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - Transaction management and control - INSERT, UPDATE, DELETE operations |
| Relational Database Concepts | 5% | - Relationship between database and SQL - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components |
| Retrieving and Sorting Data | 15% | - Sorting query results - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Operator precedence rules - Using SELECT statement and column aliases - Limiting rows and substitution variables - Arithmetic expressions and NULL values |
| Controlling User Access | 5% | - Granting privileges on tables - System vs object privileges - Roles creation and privilege assignment |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage synonyms - Create and manage indexes |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Using Functions | 25% | - Date arithmetic and date functions - Nested functions - Data type conversion: implicit and explicit - Group functions and grouping data - Character functions for string manipulation - ROUND, TRUNC, MOD functions - Restricting group results - NVL, NULLIF, COALESCE functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions |
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NEW QUESTION # 94
Which clause in an UPDATE statement typically uses a subquery to assign values to columns?
Answer: B
NEW QUESTION # 95
Which of the following can be achieved using a correlated subquery?
Answer: A
NEW QUESTION # 96
What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;
Answer: A
NEW QUESTION # 97
What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;
Answer: B
NEW QUESTION # 98
Which type of INSERT statement allows inserting rows into multiple tables using a single SELECT query?
Answer: B
NEW QUESTION # 99
......
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