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Q11. As a developer, you inherit this table as part of a project: CREATE TABLE exam (
Exam_id INTEGER UNSIGNED NOT NULL PRIMARY KEY,
Examinee_id INTEGER UNSIGNED UNIQUE, Score INTEGER UNSIGNED
What change should you make to ensure that examinee_id is an integer value throughout the table?
A. The examinee_id column should be designated as PRIMARY KEY.
B. A NOT NULL qualifier should be moved from exam-id to examinee-id.
C. The PRIMARY KEY should be dropped and re-created as PRIMARY KEY (examinee-id, exam_id).
D. A NOT NULL qualifier should be added to examinee_id.
Q12. Which three database objects have non-case-sensitive names on all operating system?
D. Stored procedure
Q13. Assume the user has just connected to the MySQL server.
What is the result of the query SELECT @ a?
A. An error that @ a is undefined
B. A single NULL
C. An empty string
D. The value of GLOBAL variable @ a
Q14. Which two keywords cannot be used in multi-table deletes?
B. ORDER BY
You can specify multiple tables in a DELETE statement to delete rows from one or more tables depending on the particular condition in the WHERE clause. However, you cannot use ORDER BY or LIMIT in a multiple-table DELETE.
Q15. Consider the table structure shown by this output: Mysql> desc city:
5 rows in set (0.00 sec) You execute this statement:
SELECT -,-, city. * FROM city LIMIT 1 What is returned?
A. An error message
B. One row with 5 columns
C. One row with 10 columns
D. One row with 15 columns
Q16. Which two code samples demonstrate valid methods for working with loops?
A. DECLARE I INT DEFAULT 0;
Test_loop: LOOP SET i =i +1;
IF i> =5 THEN
LEAVE test_loop; END IF;
END LOOP test_loop;
B. DECLARE i INT DEFAULT 0; WHILE I < 5ITERATE
SET i = i +1; END WHILE;
C. DECLARE i INT DEFAULT 0; WHILE i < 5 Do
SET i = i + 1; END WHILE;
D. DECLARE i INT DEFAULT 0;
Test _loop; LOOP SET i =i +1;
IF i >=5 THEN LEAVE; END IF;
END LOOP test_loop;
Q17. Inspect the SELECT query:
Mysql> EXPLAIN SELECT employees. Emp_no, first_name, last_name FROM employees JOIN title WHERE to_date > ‘2008-10-11’;
2 rows in set (0.00 sec)
Which action will optimize the query?
A. Add an index to the employees. emp _no column.
B. Add the keyword STRAIGHT_JOIN.
C. Add an index on the to_ date column.
D. Add the FORCE INDEX (PRIMARY) optimizer hint for the employees table.
Q18. Consider the CREATE FUNCTION statement:
CREATE FUNCTION countrycount () BEGIN
DECLARE count INT;
SELECT COUNT (*) INTO count FROM country; RETURN count ;
What is the outcome when you try to create the function?
A. An error results as the SELECT must assign the return values to a user variable.
B. An error results as the count variable is not initialized with a value.
C. An error result as the function must be defined with the CONTAINS SQL clause.
D. An error result as the variable type returned by the function must be defined with a RETURNS clause.
Routine Functions must provide a RETURNS clause noting data-type just after func_name and parameters, before characteristics.
Q19. You want to compare all columns of table A to columns with matching names in table B. You want to select the rows where those have the same values on both tables.
Which query accomplishes this?
A. SELECT * FROM tableA. tableB
B. SELECT * FROM tableA JOIN tableB
C. SELECT * FROM table A INNER JOIN tableB
D. SELECT * FROM tableA NATURAL JOIN tableB
E. SELECT & FROM tableA STRAIGHT JOIN tableB
Q20. A table country exists with a column Name. A user variable @ limitcount contains the value 20.
Which two statements are valid uses of the LIMIT clause?
A. SELECT Name FROM country LIMIT 100-50
B. SELECT Name FROM country LIMIT 100,50
C. SELECT Name FROM country LIMIT 35
D. SELECT Name FROM country LIMIT @limitcount
E. SELECT Name FROM country LIMIT RAND ()