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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Arithmetic expressions and NULL values - Limiting rows and substitution variables - Operator precedence rules - Using SELECT statement and column aliases - Sorting query results |
| DDL for Tables and Relationships | 15% | - Table structure, columns, data types - Temporary and external tables - Views management - TRUNCATE TABLE statement - Drop columns, set unused columns - Constraints management - CREATE TABLE statement |
| Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Using SET Operators | 5% | - Using ORDER BY with set operations - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators |
| Managing Tables with DML | 5% | - Transaction management and control - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Controlling User Access | 5% | - Granting privileges on tables - Roles creation and privilege assignment - System vs object privileges |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Using Functions | 25% | - ROUND, TRUNC, MOD functions - NVL, NULLIF, COALESCE functions - Data type conversion: implicit and explicit - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Restricting group results - Date arithmetic and date functions - Group functions and grouping data - Character functions for string manipulation - Nested functions |
1. How does SQL handle NULL values in arithmetic expressions?
A) Treats them as zero
B) Produces an error
C) Produces a NULL result
D) Treats them as the largest possible number
2. Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?
A) Diamonds
B) Rectangles
C) Ovals
D) Arrows
3. Which clause can be used with SET operators to sort the final result set?
A) GROUP BY
B) ORDER BY
C) HAVING
D) WHERE
4. How are NULL values treated in relational databases?
A) NULL values are not allowed in relational databases.
B) NULL values are treated as zero.
C) NULL values are treated as empty strings.
D) NULL values represent missing or unknown data.
5. What is a subquery in SQL?
A) A query used to create a table
B) A query inside another query
C) A query that combines data from multiple tables
D) A query used for joining two or more tables
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: D | Question # 5 Answer: B |
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