選擇了VCESoft提供的最新最準確的關於Oracle 1Z1-171考試產品，屬於你的成功就在不遠處。
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - Relationship between database and SQL - SQL SELECT clauses and ERD components |
| Topic 2: Using Functions | 25% | - Nested functions - ROUND, TRUNC, MOD functions - Group functions and grouping data - Restricting group results - Data type conversion: implicit and explicit - Date arithmetic and date functions - Character functions for string manipulation - NVL, NULLIF, COALESCE functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions |
| Topic 3: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 4: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 5: Data Dictionary and Time Zones | 5% | - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types |
| Topic 6: Retrieving and Sorting Data | 15% | - Sorting query results - Limiting rows and substitution variables - Operators, literals, DISTINCT keyword - Operator precedence rules - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - DEFINE and VERIFY commands |
| Topic 7: Controlling User Access | 5% | - Granting privileges on tables - Roles creation and privilege assignment - System vs object privileges |
| Topic 8: Using SET Operators | 5% | - UNION, UNION ALL, INTERSECT, MINUS operators - Matching SELECT statements - Using ORDER BY with set operations |
| Topic 9: DDL for Tables and Relationships | 15% | - CREATE TABLE statement - Constraints management - Temporary and external tables - Drop columns, set unused columns - TRUNCATE TABLE statement - Table structure, columns, data types - Views management |
| Topic 10: Managing Tables with DML | 5% | - Transaction management and control - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements |
| Topic 11: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage indexes - Create and manage synonyms - Create and manage sequences |
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問題 #46
What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;
答案：D
問題 #47
Which SQL keyword is used to remove duplicate rows from the result set of a query?
答案：A
問題 #48
What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);
答案：B
問題 #49
Which type of join retrieves only the rows with matching values in both tables?
答案：A
問題 #50
Which of the following can be achieved using a correlated subquery?
答案：D
問題 #51
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