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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Using SELECT statement and column aliases - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Operator precedence rules - Sorting query results - Arithmetic expressions and NULL values - Limiting rows and substitution variables |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage sequences - Create and manage synonyms |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Using Functions | 25% | - Data type conversion: implicit and explicit - Restricting group results - Group functions and grouping data - Character functions for string manipulation - Nested functions - Date arithmetic and date functions - NVL, NULLIF, COALESCE functions - ROUND, TRUNC, MOD functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - Transaction management and control - INSERT, UPDATE, DELETE operations |
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Views management - CREATE TABLE statement - Temporary and external tables - Table structure, columns, data types - TRUNCATE TABLE statement - Constraints management |
| Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components - Relationship between database and SQL |
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NEW QUESTION # 75
What does the INTERSECT operator do in SQL?
Answer: C
NEW QUESTION # 76
What is the purpose of the DBA_OBJECTS data dictionary view?
Answer: D
NEW QUESTION # 77
What does the COMMIT statement do in SQL?
Answer: C
NEW QUESTION # 78
Which type of INSERT statement allows inserting rows into multiple tables using a single SELECT query?
Answer: B
NEW QUESTION # 79
How can you ensure that data is sorted in descending order in a SQL query?
Answer: D
NEW QUESTION # 80
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