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| Section | Weight | Objectives |
|---|---|---|
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Retrieving and Sorting Data | 15% | - Using SELECT statement and column aliases - Operator precedence rules - Limiting rows and substitution variables - Operators, literals, DISTINCT keyword - DEFINE and VERIFY commands - Sorting query results - Arithmetic expressions and NULL values |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| DDL for Tables and Relationships | 15% | - TRUNCATE TABLE statement - Temporary and external tables - Views management - Constraints management - Table structure, columns, data types - CREATE TABLE statement - Drop columns, set unused columns |
| 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 |
| Using Functions | 25% | - NVL, NULLIF, COALESCE functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Group functions and grouping data - Data type conversion: implicit and explicit - Restricting group results - Character functions for string manipulation - ROUND, TRUNC, MOD functions - Nested functions - Date arithmetic and date functions |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
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NEW QUESTION # 49
In a relational database, what is a foreign key?
Answer: B
NEW QUESTION # 50
Which type of join returns all rows from the left table, even if there are no matches in the right table?
Answer: C
NEW QUESTION # 51
Which type of privilege allows a user to perform administrative tasks, such as creating other users?
Answer: A
NEW QUESTION # 52
What is a subquery in SQL?
Answer: D
NEW QUESTION # 53
Which SQLPlus command displays defined substitution variable values?
Answer: C
NEW QUESTION # 54
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