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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Operator precedence rules - Sorting query results - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Arithmetic expressions and NULL values - Using SELECT statement and column aliases - Limiting rows and substitution variables |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Transaction management and control - Multi-table INSERT and MERGE statements |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Using SET Operators | 5% | - Matching SELECT statements - Using ORDER BY with set operations - UNION, UNION ALL, INTERSECT, MINUS operators |
| 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 - NVL, NULLIF, COALESCE functions - Nested functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - ROUND, TRUNC, MOD functions - Character functions for string manipulation - Restricting group results - Date arithmetic and date functions - Group functions and grouping data |
| DDL for Tables and Relationships | 15% | - Table structure, columns, data types - Constraints management - Drop columns, set unused columns - CREATE TABLE statement - Views management - Temporary and external tables - TRUNCATE TABLE statement |
| Controlling User Access | 5% | - Granting privileges on tables - System vs object privileges - Roles creation and privilege assignment |
| Relational Database Concepts | 5% | - Relationship between database and SQL - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
1. Which type of privilege allows a user to perform administrative tasks, such as creating other users?
A) Table privilege
B) Object privilege
C) Schema privilege
D) System privilege
2. In a relational database, what is a foreign key?
A) A temporary key generated during query execution
B) A unique identifier for a record in a table
C) A key that is used to establish a relationship between two tables
D) A key used to sort data in a specific order
3. How is the LOCALTIMESTAMP function different from CURRENT_TIMESTAMP?
A) LOCALTIMESTAMP returns only the date, while CURRENT_TIMESTAMP returns the date and time.
B) LOCALTIMESTAMP omits time zone information, while CURRENT_TIMESTAMP includes it.
C) LOCALTIMESTAMP does not include fractional seconds, while CURRENT_TIMESTAMP does.
D) Both functions are identical in output.
4. Which SQL statement is used to create a table?
A) INSERT
B) CREATE TABLE
C) ALTER TABLE
D) ADD TABLE
5. What is the purpose of a correlated subquery?
A) A subquery that references columns from the outer query
B) A subquery that can be used only with aggregate functions
C) A subquery that depends on the result of another subquery
D) A subquery that combines data from multiple tables
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: B | Question # 5 Answer: A |
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