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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 |
| Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types - Using data dictionary views |
| Using Functions | 25% | - ROUND, TRUNC, MOD functions - Character functions for string manipulation - Group functions and grouping data - Nested functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Data type conversion: implicit and explicit - NVL, NULLIF, COALESCE functions - Date arithmetic and date functions - Restricting group results |
| DDL for Tables and Relationships | 15% | - Views management - Temporary and external tables - TRUNCATE TABLE statement - Table structure, columns, data types - Drop columns, set unused columns - Constraints management - CREATE TABLE statement |
| Retrieving and Sorting Data | 15% | - Operators, literals, DISTINCT keyword - Arithmetic expressions and NULL values - Operator precedence rules - Sorting query results - DEFINE and VERIFY commands - 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 |
| Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components - Relationship between database and SQL |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage synonyms - Create and manage indexes |
| Controlling User Access | 5% | - Roles creation and privilege assignment - Granting privileges on tables - System vs object privileges |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
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NEW QUESTION # 62
Which SQL clause is used to specify the source table in a query?
Answer: C
NEW QUESTION # 63
How are NULL values treated in relational databases?
Answer: B
NEW QUESTION # 64
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: D
NEW QUESTION # 65
What happens if a DELETE statement is executed without a WHERE clause?
Answer: D
NEW QUESTION # 66
Which SQL keyword is used to remove duplicate rows from the result set of a query?
Answer: D
NEW QUESTION # 67
......
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