Oracle Database 23ai SQL Associate 1Z1-171 exam torrent materials
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Oracle 1Z1-171 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - SQL SELECT clauses and ERD components - Relationship between database and SQL |
| Topic 2: Using Functions | 25% | - Restricting group results - Group functions and grouping data - NVL, NULLIF, COALESCE functions - Data type conversion: implicit and explicit - Character functions for string manipulation - ROUND, TRUNC, MOD functions - Date arithmetic and date functions - Nested functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions |
| Topic 3: Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Topic 4: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage sequences - Create and manage indexes - Create and manage synonyms |
| Topic 5: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 6: Data Dictionary and Time Zones | 5% | - Using data dictionary views - INTERVAL data types - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Topic 7: Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations - Matching SELECT statements |
| Topic 8: Retrieving and Sorting Data | 15% | - Sorting query results - Operator precedence rules - Arithmetic expressions and NULL values - DEFINE and VERIFY commands - Limiting rows and substitution variables - Operators, literals, DISTINCT keyword - Using SELECT statement and column aliases |
| Topic 9: DDL for Tables and Relationships | 15% | - Table structure, columns, data types - Constraints management - Views management - CREATE TABLE statement - TRUNCATE TABLE statement - Drop columns, set unused columns - Temporary and external tables |
| Topic 10: Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Topic 11: Managing Tables with DML | 5% | - INSERT, UPDATE, DELETE operations - Transaction management and control - Multi-table INSERT and MERGE statements |
Oracle Database 23ai SQL Associate Sample Questions:
What will the following query do?
DELETE FROM employees
WHERE department_id = 20;
- A. Delete all rows in the employees table
- B. Raise an error because DELETE cannot use a WHERE clause
- C. Delete the department_id column in the employees table
- D. Delete all rows where department_id is 20
Correct Answer: D 🗳️
What does the INTERSECT operator do in SQL?
- A. Returns rows that are present in both queries
- B. Combines all rows from two queries without any conditions
- C. Returns rows from the first query that are not present in the second query
- D. Combines rows from two queries and includes all duplicates
Correct Answer: A 🗳️
Which type of join includes rows that do not have matching values in the joined table?
- A. SELF JOIN
- B. OUTER JOIN
- C. INNER JOIN
- D. CROSS JOIN
Correct Answer: B 🗳️
What is the purpose of using external tables in Oracle Database?
- A. To improve the performance of complex queries
- B. To create temporary tables for session-specific data
- C. To store backup copies of database tables
- D. To manage data stored in external files using SQL
Correct Answer: D 🗳️
What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);
- A. Creates a temporary table
- B. Creates a table with no constraints
- C. Creates a table with a primary key and a NOT NULL constraint
- D. Creates a table with only VARCHAR2 and DATE columns
Correct Answer: C 🗳️
