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| Section | Weight | Objectives |
|---|---|---|
| Using Functions | 25% | - Nested functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Data type conversion: implicit and explicit - ROUND, TRUNC, MOD functions - Date arithmetic and date functions - NVL, NULLIF, COALESCE functions - Character functions for string manipulation - Group functions and grouping data - Restricting group results |
| DDL for Tables and Relationships | 15% | - Temporary and external tables - Drop columns, set unused columns - Views management - TRUNCATE TABLE statement - Table structure, columns, data types - Constraints management - CREATE TABLE statement |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage indexes - Create and manage synonyms |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - Transaction management and control - INSERT, UPDATE, DELETE operations |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Controlling User Access | 5% | - Granting privileges on tables - System vs object privileges - Roles creation and privilege assignment |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Retrieving and Sorting Data | 15% | - Operator precedence rules - Sorting query results - DEFINE and VERIFY commands - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - Operators, literals, DISTINCT keyword - Limiting rows and substitution variables |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects - Relationship between database and SQL |
1. Which data dictionary view provides information about all tables accessible to the current user?
A) USER_TABLES
B) DBA_TABLES
C) SESSION_TABLES
D) ALL_TABLES
2. What is the purpose of the SAVEPOINT statement?
A) To delete data temporarily
B) To set a point within a transaction to which a rollback can occur
C) To restart a transaction
D) To save changes permanently
3. Which command grants a user the ability to query data from a specific table?
A) GRANT SELECT ON table_name TO user_name;
B) GRANT ALL ON table_name TO user_name;
C) ALLOW SELECT ON table_name TO user_name;
D) ENABLE SELECT ON table_name TO user_name;
4. Which of the following ensures that a relational database enforces data integrity?
A) Constraints such as primary keys, foreign keys, and unique constraints
B) Redundant data storage
C) Hierarchical data organization
D) Indexes on all columns
5. In a relational database, what is a foreign key?
A) A key that is used to establish a relationship between two tables
B) A unique identifier for a record in a table
C) A temporary key generated during query execution
D) A key used to sort data in a specific order
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: A | Question # 4 Answer: A | Question # 5 Answer: A |
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