1z1-071日本語版参考資料 & 1z1-071模擬試験問題集

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Oracle 1z1-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Managing Views		- Create, modify and drop views - Updatable and read-only views
Topic 2: Controlling User Access		- Roles, granting and revoking privileges - System and object privileges
Topic 3: Conversion Functions and Conditional Expressions	10%	- NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions - Implicit and explicit data type conversion
Topic 4: Managing Tables and Constraints		- Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables - Temporary and external tables
Topic 5: Aggregating Data Using Group Functions	10%	- SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses
Topic 6: Restricting and Sorting Data	15%	- Operator precedence - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - ORDER BY clause and sorting rules
Topic 7: Working with Time Zones and Date/Time Data		- TIMESTAMP, INTERVAL data types - Time zone conversion functions
Topic 8: Manipulating Data and Managing Transactions		- Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements
Topic 9: Using Data Dictionary Views		- Retrieve metadata and object information
Topic 10: Using Subqueries to Solve Queries		- Correlated subqueries for update/delete - Single-row and multi-row subqueries
Topic 11: Using Single-Row Functions to Customize Output	20%	- Nested functions usage - Character, number, and date functions
Topic 12: Using SET Operators		- Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators
Topic 13: Retrieving Data Using SQL SELECT Statement	20%	- Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage
Topic 14: Displaying Data from Multiple Tables	15%	- Cartesian products - Equijoins and non-equijoins - Self-joins and outer joins
Topic 15: Managing Indexes, Synonyms and Sequences		- Create and use synonyms - Create and use sequences - Create and maintain indexes
Topic 16: Relational Database Concepts	10%	- ERD and SQL statement mapping - Theoretical and physical aspects of relational databases - Relationship between database and SQL

>> 1z1-071日本語版参考資料 <<

実際的な1z1-071日本語版参考資料と権威のある1z1-071模擬試験問題集

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Oracle Database SQL 認定 1z1-071 試験問題 (Q254-Q259):

質問 # 254
Which two statements are true about selecting related rows from two tables based on an Entity Relationship Diagram (ERD)? (Choose two.)

A. Rows from unrelated tables cannot be joined
B. An inner join relates rows within the same table
C. Implementing a relationship between two tables might require joining additional tables
D. Every relationship between the two tables must be implemented in a join condition
E. Relating data from a table with data from the same table is implemented with a self join

正解：C、E

質問 # 255
Examine these SQL statements which execute successfully:

Which two statements are true after execution?

A. The foreign key constraint will be enabled and DEFERRED.
B. The foreign key constraint will be disabled.
C. The primary key constraint will be enabled and IMMEDIATE.
D. The foreign key constraint will be enabled and IMMEDIATE.
E. The primary key constraint will be enabled and DEFERRED.

正解：D、E

質問 # 256
View the exhibit and examine the structure of the EMPLOYEEStable.

You want to display all employees and their managers having 100 as the MANAGER_ID. You want the output in two columns: the first column would have the LAST_NAMEof the managers and the second column would have LAST_NAMEof the employees.
Which SQL statement would you execute?

A. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
ON m.employee_id = e.manager_id
WHERE m.manager_id = 100;
B. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
ON e.employee_id = m.manager_id
WHERE m.manager_id = 100;
C. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
ON m.employee_id = e.manager_id
WHERE e.manager_id = 100;
D. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
WHERE m.employee_id = e.manager_id and AND e.manager_id = 100

正解：C

質問 # 257
Which three statements are true about indexes and their administration in an Oracle database?

A. An INVISIBLE index is not maintained when Data Manipulation Language (DML) is performed on its underlying table.
B. A DROP INDEX statement always prevents updates to the table during the drop operation
C. A descending index is a type of function-based index
D. If a query filters on an indexed column then it will always be used during execution of the query
E. An index can be created as part of a CREATE TABLE statement.
F. A UNIQUE and non-unique index can be created on the same table column

正解：C、E、F

解説：
A . This statement is incorrect. An INVISIBLE index is maintained during DML operations just like a VISIBLE index. The difference is that an INVISIBLE index is not used by the optimizer unless explicitly hinted. B. This statement is correct. When creating a table, you can define indexes on one or more columns as part of the table definition. C. This statement is incorrect. While a DROP INDEX statement will drop the index, it does not always prevent updates to the table. If the index is marked as unusable or is an invisible index, for example, updates can still be performed. D. This statement is correct. It is possible to have both a UNIQUE index and a non-unique index on the same column. The UNIQUE index enforces the uniqueness of column values, while the non-unique index does not. E. This statement is correct to some extent. Descending indexes are not function-based indexes per se, but they are indexes on which the data is sorted in descending order, as opposed to the default ascending order. However, descending indexes are conceptually related to function-based indexes because they alter the way the indexed data is stored. F. This statement is incorrect. The use of an index in query execution depends on the optimizer's decision, which is based on statistics and the cost associated with using the index. There are situations where the optimizer may choose a full table scan even if there is an index on the filter column.
Reference can be found in the Oracle Database Concepts Guide and the SQL Language Reference documentation, which detail the behavior of indexes and how they are managed within the Oracle database.

質問 # 258
View and Exhibit and examine the structure and data in the INVOICE table.

Which two statements are true regarding data type conversion in query expressions? (Choose two.)

A. inv_date > '01-02-2008' : uses implicit conversion
B. inv_amt = '0255982' : requires explicit conversion
C. inv_date = '15-february-2008' :uses implicit conversion
D. CONCAT(inv_amt, inv_date) : requires explicit conversion
E. inv_no BETWEEN '101' AND '110' : uses implicit conversion

正解：C、E

質問 # 259
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