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| Section | Weight | Objectives |
|---|---|---|
| Using Functions | 25% | - Restricting group results - Nested functions - Data type conversion: implicit and explicit - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - ROUND, TRUNC, MOD functions - Character functions for string manipulation - Date arithmetic and date functions - Group functions and grouping data - NVL, NULLIF, COALESCE functions |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Retrieving and Sorting Data | 15% | - Operator precedence rules - Sorting query results - Arithmetic expressions and NULL values - Using SELECT statement and column aliases - Operators, literals, DISTINCT keyword - Limiting rows and substitution variables - DEFINE and VERIFY commands |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| DDL for Tables and Relationships | 15% | - CREATE TABLE statement - Drop columns, set unused columns - Table structure, columns, data types - Views management - TRUNCATE TABLE statement - Constraints management - Temporary and external tables |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage indexes - Create and manage synonyms |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
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NEW QUESTION # 88
The column data type is converted to a primary key.
Answer: B
NEW QUESTION # 89
Which type of join returns all rows from the left table, even if there are no matches in the right table?
Answer: B
NEW QUESTION # 90
Which SQLPlus command displays defined substitution variable values?
Answer: C
NEW QUESTION # 91
What does the following query return?
SELECT employee_id
FROM employees
WHERE department_id IN (SELECT department_id FROM departments WHERE location_id = 1000);
Answer: D
NEW QUESTION # 92
What is required for the queries combined by a SET operator to work correctly?
Answer: D
NEW QUESTION # 93
......
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