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| Section | Weight | Objectives |
|---|---|---|
| Retrieving and Sorting Data | 15% | - Operator precedence rules - Sorting query results - Using SELECT statement and column aliases - Limiting rows and substitution variables - DEFINE and VERIFY commands - Operators, literals, DISTINCT keyword - Arithmetic expressions and NULL values |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| DDL for Tables and Relationships | 15% | - Constraints management - Table structure, columns, data types - TRUNCATE TABLE statement - Drop columns, set unused columns - CREATE TABLE statement - Views management - Temporary and external tables |
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Using Functions | 25% | - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Character functions for string manipulation - Date arithmetic and date functions - Data type conversion: implicit and explicit - Restricting group results - Nested functions - ROUND, TRUNC, MOD functions - NVL, NULLIF, COALESCE functions - Group functions and grouping data |
| Relational Database Concepts | 5% | - SQL SELECT clauses and ERD components - Relationship between database and SQL - Relational database theoretical and physical aspects |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Data Dictionary and Time Zones | 5% | - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - Using data dictionary views |
| Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements - Transaction management and control |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
Question 1
Which of the following SQL commands retrieves data from a relational database?
A. INSERT
B. UPDATE
C. SELECT
D. DELETE
Question 2
In a relational database, what is a foreign key?
A. A key used to sort data in a specific order
B. A temporary key generated during query execution
C. A key that is used to establish a relationship between two tables
D. A unique identifier for a record in a table
Question 3
What is the purpose of using external tables in Oracle Database?
A. To manage data stored in external files using SQL
B. To create temporary tables for session-specific data
C. To improve the performance of complex queries
D. To store backup copies of database tables
Question 4
What happens when a unique index is created on a table column?
A. The column can only contain NULL values.
B. The column cannot contain duplicate values.
C. The column values are automatically encrypted.
D. The column data type is converted to a primary key.
Question 5
Which of the following statements creates an ascending sequence starting at 100 and incrementing by 10?
A. CREATE SEQUENCE seq_1 START WITH 100 INCREMENT BY 10;
B. CREATE SEQUENCE seq_1 START WITH 100 INCREMENT BY -10;
C. CREATE SEQUENCE seq_1 START WITH 10 INCREMENT BY 100;
D. CREATE SEQUENCE seq_1 START WITH 10 INCREMENT BY -100;
Solutions:
| Question 1 Answer: C | Question 2 Answer: C | Question 3 Answer: A | Question 4 Answer: B | Question 5 Answer: A |
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