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The Oracle 1z1-071 exam covers a wide range of topics related to SQL and relational database management, including understanding SQL statements, managing database objects, manipulating data, and controlling user access to databases. 1z1-071 exam is designed to test the candidate's knowledge of SQL syntax, database design concepts, and data manipulation techniques.
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NEW QUESTION # 56
View the Exhibit and examine the structure of the PRODUCTStable
Which two tasks would require subqueries? (Choose two.)
- A. display the minimum PROD_LIST_PRICEfor each product status
- B. display suppliers whose PROD_LIST_PRICEis less than 1000
- C. display the number of products whose PROD_LIST_PRICEis more than the average PROD_LIST_PRICE
- D. display the total number of products supplied by supplier 102which have a product status as 'OBSOLETE'
- E. display all products whose PROD_MIN_PRICEis more than the average PROD_LIST_PRICEof all products, and whose status is orderable
Answer: C,E
Explanation:
Explanation
NEW QUESTION # 57
You execute the SQL statement:
What is the outcome?
- A. It fails because the condition for the CNAMES constraint is not valid.
- B. It fails because the NOT NULL and DEFAULT options cannot be combined for the same column.
- C. It succeeds and an index is created for CITIZEN_ID.
- D. It succeeds and CITY can contain only 'SEATTLE' or null for all rows.
Answer: B
NEW QUESTION # 58
View the exhibit and examine the description of the DEPARTMENTSand EMPLOYEEStables.
The retrieve data for all the employees for their EMPLOYEE_ID, FIRST_NAME, and DEPARTMENT NAME, the following SQL statement was written:
SELECT employee_id, first_name, department_name
FROM employees
NATURAL JOIN departments;
The desired output is not obtained after executing the above SQL statement. What could be the reason for this?
- A. The table prefix is missing for the column names in the SELECTclause.
- B. The EMPLOYEESand DEPARTMENTStables have more than one column with the same column name and data type.
- C. The NATURAL JOINclause is missing the USINGclause.
- D. The DEPARTMENTStable is not used before the EMPLOYEEStable in the FROMclause.
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Natural join needs only one column to be the same in each table. The EMPLOYEESand DEPARTMENTS tables have two columns that are the same (Department_ID and Manager_ID)
NEW QUESTION # 59
Examine the description of the EMPLOYEES table:
You write this failing statement:
SELECT dept_no AS department_id, MAX (salary) As max_sal
FROM employees
WHERE salary >10000
GROUP BY department_id
ORDER BY max_sal;
Which clause causes the error?
- A. ORDER BY
- B. GROUP BY
- C. SELECT
- D. WHERE
Answer: B
NEW QUESTION # 60
Examine these SQL statements which execute successfully:
Which two statements are true after execution?
- A. The primary key constraint will be enabled and DEFERRED.
- B. The foreign key constraint will be disabled.
- C. The foreign key constraint will be enabled and IMMEDIATE.
- D. The foreign key constraint will be enabled and DEFERRED.
- E. The primary key constraint will be enabled and IMMEDIATE.
Answer: C,E
Explanation:
After the execution of the given SQL statements:
* B. The primary key constraint will be enabled and IMMEDIATE. This is true. The last statement ENABLE CONSTRAINT emp_emp_no_pk; enables the primary key constraint immediately.
* E. The foreign key constraint will be enabled and IMMEDIATE. This is correct as well. The foreign key constraint emp_mgr_fk was not explicitly disabled, so it remains enabled and in the immediate checking mode.
Options A, C, and D are incorrect:
* A is incorrect because constraints are immediate by default; they are not deferred unless explicitly stated.
* C is incorrect because the foreign key constraint emp_mgr_fk was never disabled with the given statements.
* D is incorrect because there is no statement altering the foreign key constraint to a deferred state.
NEW QUESTION # 61
The BOOKS_TRANSACTIONStable exists in your database.
Examine the SQL statement:
SQL>SELECT * FROM books_transactionsORDER BY 3;
What is the outcome on execution?
- A. Rows are displayed sorted in ascending order of the values in the third column in the table.
- B. Rows are displayed in the order that they are stored in the table only for the first three rows.
- C. The execution tails unless the numeral 3 in the order by clause is replaced by a column name,
- D. Rows are displayed in the order that they are stored in the table only for the three rows with the lowest values in the key column.
Answer: B
NEW QUESTION # 62
Which task can be performed by using a single Data Manipulation Language (DML) statement?
- A. removing all data only from a single column on which a primary key constraint is defined
- B. adding a column constraint while inserting a row into a table
- C. adding a column with a default value while inserting a row into a table
- D. removing all data from a single column on which a unique constraint is defined
Answer: D
NEW QUESTION # 63
Examine these statements:
CREATE TABLE alter_test (c1 VARCHAR2(10), c2 NUMBER(10));
INSERT INTO alter_test VALUES ('123' 123);
COMMIT;
Which is true ahout modifyIng the columns in AITER_TEST?
- A. c2 can be changed to NUMBER(5) but c1 cannot be changed to VARCHAN2 (5).
- B. c1 can be changed to NUMBER(10) but c2 cannot be changed to VARCHAN2 (10).
- C. c2 can be changed to VARCHAR2(10) but c1 cannot be changed to NUMBER (10).
- D. c1 can be changed to NUMBER(10) and c2 can be changed to VARCHAN2 (10).
- E. c1 can be changed to VARCHAR2(5) and c2 can be changed to NUMBER (12,2).
Answer: E
Explanation:
In Oracle SQL, the ALTER TABLE statement is used to modify the definition of a table after it has been created. Specific changes are allowed depending on the current data type of the column and the data it contains.
A). You cannot change a VARCHAR2 column to NUMBER if the table contains rows with non-numeric values, which is the case with '123' as a VARCHAR2; it is a string, not a number.
B). You can reduce the size of a NUMBER column if the data will still fit within the new precision, but you cannot change a VARCHAR2 column to a smaller size if it contains values that exceed the new size limit.
C). You cannot change a NUMBER column to VARCHAR2 if the table contains rows because the existing data type of NUMBER does not match the new data type of VARCHAR2.
D). Similar to A, you cannot change the data type from VARCHAR2 to NUMBER if non-numeric data is present.
E). You can change a VARCHAR2(10) column to VARCHAR2(5) if all existing rows have values that fit within the new size, and you can change a NUMBER column to have a different scale (NUMBER(12,2)).
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"
NEW QUESTION # 64
Refer to the exhibit.
Which two queries execute successfully?
- A. SELECT prod_id, exp_date FROM products
UNION ALL
SELECT prod_id, NULL FROM new_products; - B. SELECT * FROM products
UNION
SELECT * FROM new_products; - C. SELECT prod_id, prod_name FROM products
INTERSECT
SELECT 100, prod_name FROM newproducts; - D. SELECT prod_id FROM products
UNION ALL
SELECT prod_id, prod_name FROM new_products; - E. SELECT k FROM products
MINUS
SELECT prod_id FROM new_products;
Answer: A,B
NEW QUESTION # 65
Evaluate the following two queries:
Which statement is true regarding the above two queries?
- A. There would be no change in performance.
- B. Performance would degrade in query 2.
- C. Performance would improve in query 2 only if there are null values in the CUST_CREDIT_LIMIT column.
- D. Performance would improve in query 2.
Answer: A
NEW QUESTION # 66
Which three statements are true about sequences in a single instance Oracle database? (Choose three.)
- A. A sequence's unallocated cached value are lost if the instance shuts down
- B. Sequences can always have gaps
- C. Two or more tables cannot have keys generated from the same sequence
- D. A sequence number that was allocated can be rolled back if a transaction fails
- E. A sequence can issue duplicate values
- F. A sequence can only be dropped by a DBA
Answer: A,D,F
Explanation:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_6015.htm
NEW QUESTION # 67
View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables. (Choose the best answer.)
You executed this UPDATE statement:
Which statement is true regarding the execution?
- A. It would not execute because two tables cannot be referenced in a single UPDATE statement.
- B. It would not execute because a SELECT statement cannot be used in place of a table name.
- C. It would not execute because a subquery cannot be used in the WHERE clause of an UPDATE statement.
- D. It would execute and restrict modifications to the columns specified in the SELECT statement.
Answer: D
NEW QUESTION # 68
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?
- A. Compare Period ADDM report.
- B. AWR Compare Period report.
- C. Taking a new snapshot and comparing it with a preserved snapshot.
- D. Active Session History (ASH) report.
Answer: B
NEW QUESTION # 69
Which statements are true? (Choose all that apply.)
- A. The usernames of all the users including the database administrators are stored in the data dictionary.
- B. The data dictionary views consists of joins of dictionary base tables and user-defined tables.
- C. The USER_CONS_COLUMNSview should be queried to find the names of the columns to which a constraint applies.
- D. The data dictionary is created and maintained by the database administrator.
- E. Views with the same name but different prefixes, such as DBA, ALLand USER, use the same base tables from the data dictionary.
- F. Both USER_OBJECTSand CATviews provide the same information about all the objects that are owned by the user.
Answer: A,C,E
Explanation:
Explanation/Reference:
References:
https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm
NEW QUESTION # 70
Which two statements are true about the ORDER BY clause when used with a SQL statement containing a SET operator such as UNION? (Choose two.)
- A. Column positions must be used in the ORDER BY clause.
- B. The first column in the first SELECT of the compound query with the UNION operator is used by default to sort output in the absence of an ORDER BY clause.
- C. Only column names from the first SELECT statement in the compound query are recognized.
- D. Each SELECT statement in the compound query must have its own ORDER BY clause.
- E. Each SELECT statement in the compound query can have its own ORDER BY clause.
Answer: C,E
NEW QUESTION # 71
View the Exhibit and examine the details of PRODUCT_INFORMATIONtable.
You have the requirement to display PRODUCT_NAMEfrom the table where the CATEGORY_IDcolumn has values 12or 13, and the SUPPLIER_IDcolumn has the value 102088. You executed the following SQL statement:
SELECT product_name
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 execute and the output would display the desired result.
- B. It would not execute because the same column has been used in both sides of the ANDlogical operator to form the condition.
- C. It would execute but the output would return no rows.
- D. It would not execute because the entire WHEREclause condition is not enclosed within the parentheses.
Answer: C
NEW QUESTION # 72
Which two statements are true about the ORDER BYclause when used with a SQL statement containing a SET operator such as UNION? (Choose two.)
- A. Each SELECT statement in the compound query must have its own ORDER BYclause.
- B. Only column names from the first SELECTstatement in the compound query are recognized.
- C. The first column in the first SELECTof the compound query with the UNIONoperator is used by default to sort output in the absence of an ORDER BYclause.
- D. Each SELECTstatement in the compound query can have its own ORDER BYclause.
- E. Column positions must be used in the ORDER BYclause.
Answer: B,D
NEW QUESTION # 73
Examine the structure of the EMPLOYEES table.
You must display the maximum and minimum salaries of employees hired 1 year ago.
Which two statements would provide the correct output? (Choose two.)
- A. SELECT MIN(Salary) minsal, MAX(salary) maxsal
FROM employees
WHERE hire_date < SYSDATE-365
GROUP BY MIN(salary), MAX(salary); - B. SELECT minsal, maxsal
FROM (SELECT MIN(salary) minsal, MAX(salary) maxsal
FROM employees
WHERE hire_date < SYSDATE-365
GROUP BY MIN(salary), MAX(salary)); - C. SELECT MIN(Salary), MAX(salary)
FROM (SELECT salary FROM
employees
WHERE hire_date < SYSDATE-365); - D. SELECT minsal, maxsal
FROM (SELECT MIN(salary) minsal, MAX(salary) maxsal
FROM employees
WHERE hire_date < SYSDATE-365)
GROUP BY maxsal, minsal;
Answer: C,D
NEW QUESTION # 74
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