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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Retrieving and Sorting Data | 15% | - Operator precedence rules - Sorting query results - Operators, literals, DISTINCT keyword - DEFINE and VERIFY commands - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Using SELECT statement and column aliases |
| Topic 2: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 3: Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - Relationship between database and SQL - SQL SELECT clauses and ERD components |
| Topic 4: Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - Transaction management and control - INSERT, UPDATE, DELETE operations |
| Topic 5: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage indexes - Create and manage sequences |
| Topic 6: Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Topic 7: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 8: Using Functions | 25% | - Nested functions - Group functions and grouping data - Date arithmetic and date functions - Data type conversion: implicit and explicit - NVL, NULLIF, COALESCE functions - Restricting group results - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Character functions for string manipulation - ROUND, TRUNC, MOD functions |
| Topic 9: DDL for Tables and Relationships | 15% | - Temporary and external tables - Views management - CREATE TABLE statement - TRUNCATE TABLE statement - Constraints management - Table structure, columns, data types - Drop columns, set unused columns |
| Topic 10: Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Topic 11: Controlling User Access | 5% | - System vs object privileges - Granting privileges on tables - Roles creation and privilege assignment |
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NEW QUESTION # 88
What happens when a unique index is created on a table column?
Answer: A
NEW QUESTION # 89
What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;
Answer: D
NEW QUESTION # 90
What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;
Answer: A
NEW QUESTION # 91
Which function is used to convert a string to uppercase in SQL?
Answer: B
NEW QUESTION # 92
Which clause is used to ensure that only specific rows are deleted in a DELETE statement?
Answer: B
NEW QUESTION # 93
......
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