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Oracle 1Z0-171 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| DDL for Tables and Relationships | 15% | - Constraints management - Temporary and external tables - Drop columns, set unused columns - Table structure, columns, data types - CREATE TABLE statement - TRUNCATE TABLE statement - Views management |
| Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements - Using ORDER BY with set operations |
| Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
| Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Retrieving and Sorting Data | 15% | - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - Operators, literals, DISTINCT keyword - Sorting query results - DEFINE and VERIFY commands - Operator precedence rules - Limiting rows and substitution variables |
| Using Subqueries | 5% | - Single-row and multi-row subqueries - Correlated subqueries for update and delete |
| Using Functions | 25% | - Restricting group results - Data type conversion: implicit and explicit - Group functions and grouping data - NVL, NULLIF, COALESCE functions - Character functions for string manipulation - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Nested functions - ROUND, TRUNC, MOD functions - Date arithmetic and date functions |
| Controlling User Access | 5% | - System vs object privileges - Roles creation and privilege assignment - Granting privileges on tables |
| Managing Tables with DML | 5% | - Transaction management and control - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
Oracle Database 23ai SQL Associate Sample Questions:
Question 1
What is the difference between UNION and UNION ALL?
A. UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
B. UNION works with subqueries, while UNION ALL does not.
C. UNION includes all rows, while UNION ALL removes duplicates.
D. UNION combines columns, while UNION ALL combines rows.
Question 2
What happens when the maximum value of a sequence is reached?
A. The sequence stops generating values.
B. The sequence starts decrementing values.
C. An error is raised, and the sequence must be recreated.
D. The sequence resets to the starting value if the CYCLE option is specified.
Question 3
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 a primary key and a NOT NULL constraint
C. Creates a table with no constraints
D. Creates a table with only VARCHAR2 and DATE columns
Question 4
What does the EXISTS operator check in a subquery?
A. If the subquery references the outer query
B. If the subquery contains only unique values
C. If the subquery returns a specific number of rows
D. If the subquery returns any rows
Question 5
What is the relationship between SQL and a relational database?
A. SQL is a file system used to store relational database data.
B. SQL is used to create flat file databases.
C. SQL is a scripting language used for file manipulation.
D. SQL is a standard query language used to interact with relational databases
Solutions:
| Question 1 Answer: A | Question 2 Answer: D | Question 3 Answer: B | Question 4 Answer: D | Question 5 Answer: D |
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