1z0-071 Exam Study Guide Free Practice Test LAST UPDATED DATE Jun 25, 2026
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Oracle 1z0-071 certification exam is ideal for IT professionals who have experience working with SQL programming and database management. 1z0-071 exam is suitable for database administrators, developers, and business intelligence professionals who want to improve their skills and demonstrate their expertise in SQL programming. Additionally, 1z0-071 exam is also suitable for students and entry-level professionals who want to pursue a career in database management.
NEW QUESTION # 166
Examine this list of requirements for a sequence:
1. Name:EMP_SEQ
2. First value returned:1
3. Duplicates are never permitted.
4. Provide values to be inserted into the EMPLOYEES.EMPLOYEE_ID COLUMN.
5. Reduce the chances of gaps in the values.
Which two statements will satisfy these requirements?
- A. CREATE SEQUENCE emp_seq;
- B. CREATE SEQUENCE emp_seq NOCACHE;
- C. CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;
- D. CREATE SEQUENCE emp_seq START WITH 1 INCRENENT BY 1 NOCACHE;
- E. CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CYCLE;
- F. CREATE SEQUENCE emp_seq START WITH 1 CACHE;
Answer: C,D
Explanation:
* A: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 NOCACHE;' is correct for ensuring unique values without gaps as much as possible by not caching sequence numbers, which might otherwise be lost in a system crash.
* B: CYCLE allows the sequence to restart when its max/min value is reached, which does not help with requirement 3 (duplicates are never permitted). Therefore, B is incorrect.
* C: This lacks the necessary attributes like START WITH and INCREMENT BY which are crucial to defining a sequence. Thus, statement C is incorrect.
* D: 'CREATE SEQUENCE emp_seq START WITH 1 CACHE;' might introduce gaps due to the caching of sequence numbers. This statement is somewhat contrary to requirement 5.
* E: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;' will provide continuous unique values, but may include gaps when the cache is lost due to a restart, yet it is more efficient and still generally aligns with the requirements. Hence, statement E is considered correct.
* F: This lacks detail and is too ambiguous, lacking the necessary parameters. Therefore, F is incorrect.
NEW QUESTION # 167
Which three statements are true about GLOBAL TEMPORARY TABLES?
- A. A TRUNCATE command issued in a session causes all rows in a GLOBAL TEMPORARY TABLE for the issuing session to be deleted.
- B. Any GLOBAL TEMPORARY TABLE rows existing at session termination will be deleted.
- C. GLOBAL TEMPORARY TABLE space allocation occurs at session start.
- D. A DELETE command on a GLOBAL TEMPORARY TABLE cannot be rolled back.
- E. A GLOBAL TEMPORARY TABLE's definition is available to multiple sessions.
- F. GLOBAL TEMPORARY TABLE rows inserted by a session are available to any other session whose user has been granted select on the table.
Answer: A,B,E
NEW QUESTION # 168
View the Exhibit and examine PRODUCTS and ORDER_ITEMS tables.
You executed the following query to display PRODUCT_NAME and the number of times the product has been ordered:
SELECT p.product_name, i.item_cnt
FROM (SELECT product_id, COUNT (*) item_cnt
FROM order_items
GROUP BY product_id) i RIGHT OUTER JOIN products p
ON i.product_id = p.product_id;
What would happen when the above statement is executed?
- A. The statement would not execute because the GROUP BY clause cannot be used in the inline.
- B. The statement would not execute because inline views and outer joins cannot be used together.
- C. The statement would execute successfully to produce the required output.
- D. The statement would not execute because the ITEM_CNT alias cannot be displayed in the outer query.
Answer: C
NEW QUESTION # 169
Examine this partial command:
Which two clauses are required for this command to execute successfully? (Choose two.)
- A. the REJECT LIMITclause
- B. the LOCATIONclause
- C. the DEFAULT DIRECTORYclause
- D. the ACCESS PARAMETERSclause
- E. the access driver TYPEclause
Answer: B,E
NEW QUESTION # 170
Which two statements are true about the WHERE and HAVING clauses in a SELECT statement?
- A. The WHERE clause can be used to exclude rows before dividing them into groups.
- B. WHERE and HAVING clauses can be used in the same statement only if applied to different table columns.
- C. The WHERE clause can be used to exclude rows after dividing them into groups
- D. The HAVING clause can be used with aggregating functions in subqueries.
- E. Aggregating functions and columns used in HAVING clauses must be specified in these SELECT list of a query.
Answer: A,E
Explanation:
In SQL, the WHERE and HAVING clauses are used to filter records; the WHERE clause is applied before grouping the records, while the HAVING clause is used after grouping the records, particularly when using aggregation functions.
Statement D is true because the HAVING clause is used to filter groups based on the result of aggregate functions. Therefore, any column or aggregate function appearing in the HAVING clause must also appear in the SELECT list of the query, unless it is used as part of an aggregate function.
Statement E is true because the WHERE clause is designed to filter rows before they are grouped into aggregate groups in a GROUP BY clause. This is a fundamental aspect of SQL that optimizes query performance by reducing the number of rows to be processed in the aggregate phase.
Statements A, B, and C are incorrect based on the following:
A is incorrect because the WHERE clause does not operate on groups but on individual rows before grouping.
B is misleading; while WHERE and HAVING can be used in the same statement, their usage is not restricted to different columns. They perform different functions (row-level filtering vs. group-level filtering).
C is incorrect because subqueries using aggregate functions typically do not use HAVING clauses; rather, HAVING is used in the outer query to filter the results of aggregates.
NEW QUESTION # 171
Evaluate the following two queries:
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit IN (1000, 2000, 3000);
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit = 1000 or cust_credit_limit = 2000 or
cust_credit_limit = 3000
Which statement is true regarding the above two queries?
- A. Performance would improve in query 2.
- B. Performance would improve in query 2 only if there are null values in the CUST_CREDIT_LIMIT column.
- C. There would be no change in performance.
- D. Performance would degrade in query 2.
Answer: C
NEW QUESTION # 172
Which three statements are true about multiple row subqueries? (Choose three.)
- A. Two or more values are always returned from the subquery.
- B. They can contain GROUP BY clauses.
- C. They can contain HAVINGclauses.
- D. They can return multiple columns.
- E. They cannot contain a subquery.
Answer: B,C,D
NEW QUESTION # 173
Which three are true about privileges and roles?
- A. A user has all object privileges for every object in their schema by default.
- B. A role can contain a combination of several privileges and roles.
- C. All roles are owned by the SYS schema.
- D. A role is owned by the user who created it.
- E. PUBLIC can be revoked from a user.
- F. System privileges always set privileges for an entire database.
- G. PUBLIC acts as a default role granted to every user in a database.
Answer: A,B,G
NEW QUESTION # 174
Which normal form is a table in if it has no multi-valued attributes and no partial dependencies?
- A. Fourth normal form
- B. Third normal form
- C. First normal form
- D. Second normal form
Answer: D
NEW QUESTION # 175
You issue the following command to drop the PRODUCTS table:
SQL>DROP TABLE products;
What is the implication of this command? (Choose all that apply.)
- A. The pending transaction in the session is committed
- B. All data along with the table structure is deleted
- C. All data in the table are deleted but the table structure will remain
- D. All viewsand synonyms will remain but they are invalidated
- E. All indexes on the table will remain but they are invalidated
Answer: A,B,D
NEW QUESTION # 176
Examine the commands used to create the DEPARTMENT_DETAILS and the COURSE-DETAILS tables:
SQL> CREATE TABLE DEPARTMfiNT_DETAILS
DEPARTMENT_ID NUMBER PRIMARY KEY ,
DEPARTMEHT_NAME VARCHAR2(50) ,
HOD VARCHAP2(50));
SQL> CREATE TABLE COURSE-DETAILS
(COURSE ID NUMBER PRIMARY KEY ,
COURS_NAME VARCHAR2 (50) ,
DEPARTMEHT_ID NUMBER REFERENCES DEPARTMENT_DETAIL
You want to generate a list of all department IDs along with any course IDs that may have been assigned to them.
Which SQL statement must you use?
- A. SELECT d.departranc_id, c.cours<<_id FROM cource_deatils c LEFT OUTER JOIN departmnt_details d ON (c.dapartmsnt_id=d.departtnent_id);
- B. SELECT d.department id. ccours_id FROM department_details d RIGHT OUTER JOIN course_details c ON (d.department_id);
- C. SELECT d.department_id, c. course_id FROM dapartment_details d RIGHT OUTER JOIN course_dotails c ON (c.depattnient_id=d.department_id) ;
- D. SELECT d.department_id, c.course_id FROM department_details d LEFT OUTER JOIN course_details c ON (d.department___id).- (DEPARTMENT_ID) ;
Answer: D
NEW QUESTION # 177
Which two are SQL features? (Choose two.)
- A. processing sets of data
- B. providing update capabilities for data in external files
- C. providing graphical capabilities
- D. providing variable definition capabilities
- E. providing database transaction control
Answer: A,E
Explanation:
Explanation/Reference: https://docs.oracle.com/database/121/TGSQL/tgsql_sqlproc.htm#TGSQL175
https://www.tutorialspoint.com/sql/sql-transactions.htm
NEW QUESTION # 178
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 executes successfully and gives the required result.
- B. It generates an error because NULL cannot be specified as a return value.
- C. It generates an error because multiple conditions cannot be specified for the WHEN clause.
- D. It generates an error because CASE cannot be used with group functions.
Answer: A
Explanation:
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
NEW QUESTION # 179
Examine this description of the EMP table:
You execute this query:
SELECT deptno AS "departments", SUM (sal) AS "salary"
FROM emp
GROUP | BY 1
HAVING SUM (sal)> 3 000;
What is the result?
- A. only departments where the total salary is greater than 3000, ordered by department
- B. all departments and a sum of the salaries of employees with a salary greater than 3000
- C. an error
- D. only departments where the total salary is greater than 3000, returned in no particular order
Answer: C
NEW QUESTION # 180
You want to write a query that prompts for two column names and the WHERE condition each time it is executed in a session but only prompts for the table name the first time it is executed.
The variables used in your query are never undefined in your session?
Which query can be used?
- A. Option A
- B. Option D
- C. Option C
- D. Option E
- E. Option B
Answer: B
NEW QUESTION # 181
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