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| Section | Weight | Objectives |
|---|---|---|
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Displaying Data from Multiple Tables | 10% | - Cartesian products - Different types of joins: equijoin, non-equijoin, outer join, self-join |
| Retrieving and Sorting Data | 15% | - Limiting rows and substitution variables - Sorting query results - DEFINE and VERIFY commands - Using SELECT statement and column aliases - Operator precedence rules - Operators, literals, DISTINCT keyword - Arithmetic expressions and NULL values |
| Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types - Using data dictionary views |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
| Using Functions | 25% | - Date arithmetic and date functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Nested functions - Data type conversion: implicit and explicit - Character functions for string manipulation - Restricting group results - Group functions and grouping data - NVL, NULLIF, COALESCE functions - ROUND, TRUNC, MOD functions |
| DDL for Tables and Relationships | 15% | - Drop columns, set unused columns - Views management - CREATE TABLE statement - Temporary and external tables - TRUNCATE TABLE statement - Table structure, columns, data types - Constraints management |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relationship between database and SQL - Relational database theoretical and physical aspects |
Question 1
What is a subquery in SQL?
A. A query used to create a table
B. A query that combines data from multiple tables
C. A query inside another query
D. A query used for joining two or more tables
Question 2
Which clause can be used with SET operators to sort the final result set?
A. ORDER BY
B. HAVING
C. WHERE
D. GROUP BY
Question 3
Which of the following SQL commands retrieves data from a relational database?
A. UPDATE
B. DELETE
C. INSERT
D. SELECT
Question 4
What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;
A. Retrieves employees with salary less than 5000, sorted by department ID
B. Retrieves all employees, sorted by department ID
C. Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order
D. Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order
Question 5
Which clause in a SQL SELECT statement is used to define the columns to be retrieved?
A. FROM
B. SELECT
C. WHERE
D. GROUP BY
Solutions:
| Question 1 Answer: C | Question 2 Answer: A | Question 3 Answer: D | Question 4 Answer: C | Question 5 Answer: B |
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