1z0-071試験勉強過去問 & 1z0-071合格対策

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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL 認定 1z0-071 試験問題 (Q98-Q103):

質問 # 98
See the Exhibit and examine the structure of the PROMOTIONS table:

Using the PROMOTIONS table,
you need to find out the average cost for all promos in the range $0-2000 and $2000-5000 in category A.
You issue the following SQL statements:

What would be the outcome?

A. It generates an error because NULL cannot be specified as a return value.
B. It generates an error because CASE cannot be used with group functions.
C. It generates an error because multiple conditions cannot be specified for the WHEN clause.
D. It executes successfully and gives the required result.

正解：D

解説：
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END

質問 # 99
View the Exhibit and examine the details of the PRODUCT_INFORMATION table.

You have the requirement to display PRODUCT_NAME and LIST_PRICE from the table where the CATEGORYJD column has values 12 or 13, and the SUPPLIER_ID column has the value 102088. You executed the following SQL statement:
SELECT product_name, list_price
FROM product_information
WHERE (category_id = 12 AND category_id = 13) AND supplier_id = 102088; Which statement is true regarding the execution of the query?

A. It would not execute because the entire WHERE clause is not enclosed within parentheses.
B. It would not execute because the same column has been used twice with the AND logical operator.
C. It would execute but would return no rows.
D. It would execute and return the desired.

正解：C

質問 # 100
View the exhibit and examine the structure of the PROMOTIONS table.

You have to generate a report that displays the promo name and start date for all promos that started after the last promo in the 'INTERNET' category.
Which query would give you the required output?

A. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date IN (SELECT promo_begin_date
FROM promotions
WHERE promo_category= 'INTERNET');
B. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date> ANY (SELECT promo_begin_date
FROM promotions
WHERE promo_category= 'INTERNET');
C. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date > ALL (SELECT promo_begin_date
FROM promotions
WHERE promo_category = 'INTERNET');
D. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date> ALL (SELECT MAX (promo_begin_date)
FROM promotions) AND
promo_category= 'INTERNET';

正解：C

質問 # 101
You must find the number of employees whose salary is lower than employee 110.
Which statement fails to do this?

A. SELECT COUNT (*)
FROM employees
JOIN employees a
ON e. salary<
a. salary
WHERE a. employee_ id= 110;
B. SELECT COUNT (* )
FROM employees
WHERE salary < (SELECT salary FROM employees WHERE employee id =
110) ;
C. SELECT COUNT (*)
FROM employees e
JOIN (SELECT salary FROM employees WHERE employee_ id= 110) a
ON e. salary< a. salary;
D. SELECT COUNT (* )
FROM employees e
WHERE e. salary < (SELECT a. salary FROM employees a WHERE e. employee_ id = 110);

正解：D

質問 # 102
.No user-defined locks are used in your database.
Which three are true about Transaction Control Language (TCL)?

A. COMMIT erases all the transaction's savepoints and releases its locks.
B. ROLLBACK to SAVEPOTNT undoes the transaction's changes made since the named savepoint and then ends the transaction.
C. COMMIT ends the transaction and makes all its changes permanent.
D. ROLLBACK without the TO SAVEPOINT clause undoes all the transaction's changes but does not erase its savepoints.
E. ROLLBACK without the TO SAVEPOINT clause undoes all the transaction's changes but does not release its locks.
F. ROLLBACK without the TO SAVEPOINT clause undoes alt the transaction's changes, releases its locks, and erases all its savepoints.

正解：A、C、F

質問 # 103
......

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