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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Sorting query results - Operator precedence rules - Limiting rows and substitution variables - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects - Relationship between database and SQL |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - INSERT, UPDATE, DELETE operations - Transaction management and control |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
| Using Functions | 25% | - Data type conversion: implicit and explicit - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Nested functions - Date arithmetic and date functions - NVL, NULLIF, COALESCE functions - Restricting group results - Group functions and grouping data - ROUND, TRUNC, MOD functions - Character functions for string manipulation |
| DDL for Tables and Relationships | 15% | - Views management - Temporary and external tables - Table structure, columns, data types - Drop columns, set unused columns - Constraints management - TRUNCATE TABLE statement - CREATE TABLE statement |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
1. Which SQL clause can be used in Oracle to limit the number of rows returned?
A) WHERE
B) DISTINCT
C) FETCH FIRST n ROWS ONLY
D) GROUP BY
2. Which function is used to convert a string to uppercase in SQL?
A) CONVERT_UPPER
B) TO_UPPERCASE
C) CASE_UPPER
D) UPPER
3. What does the COMMIT statement do in SQL?
A) Begins a new transaction
B) Discards all pending changes in the transaction
C) Saves all pending changes to the database permanently
D) Rolls back changes to a previous state
4. What happens if a privilege is revoked from a user who has granted the same privilege to others?
A) The privilege is revoked from all other users.
B) The privilege is transferred to another user.
C) The privilege is retained by the other users.
D) The privilege cannot be revoked in this scenario.
5. What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;
A) Deletes the employees table
B) Removes duplicate rows from the employees table
C) Sets the salary column to NULL for all rows
D) Drops the salary column from the employees table
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: A | Question # 5 Answer: D |
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