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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Operators, literals, DISTINCT keyword - Sorting query results - DEFINE and VERIFY commands - Operator precedence rules - Using SELECT statement and column aliases - Limiting rows and substitution variables - Arithmetic expressions and NULL values |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Transaction management and control - Multi-table INSERT and MERGE statements |
| DDL for Tables and Relationships | 15% | - Views management - Drop columns, set unused columns - Temporary and external tables - Table structure, columns, data types - CREATE TABLE statement - TRUNCATE TABLE statement - Constraints management |
| Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types - Using data dictionary views |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Using Functions | 25% | - ROUND, TRUNC, MOD functions - Character functions for string manipulation - Restricting group results - Nested functions - NVL, NULLIF, COALESCE functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Date arithmetic and date functions - Group functions and grouping data - Data type conversion: implicit and explicit |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
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NEW QUESTION # 42
Which function returns the current system date and time in the database session's time zone?
Answer: B
NEW QUESTION # 43
How are NULL values treated in relational databases?
Answer: B
NEW QUESTION # 44
Which type of join includes rows that do not have matching values in the joined table?
Answer: D
NEW QUESTION # 45
What is a SELF JOIN in SQL?
Answer: B
NEW QUESTION # 46
What will the following SQL statement output?
SELECT first_name || ' ' || last_name AS full_name FROM employees;
Answer: C
NEW QUESTION # 47
......
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