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2016 Oct 1Z0-882 exam answers

Q1. 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 () 

Answer: B,C 


Q2. You create a table and a stored procedure: 

CREATE TABLE t1 (f1 int); 

INSERT INTO t1 VALUES (1), (2) , (3), (4), (5); 

CREATE PROCEDURE sum_t1() 

BEGIN 

DECLARE done INT DEFAULT 0; 

DECLARE va1 INT; 

DECLARE result CURSOR FOR SELECT f1 FROM t1; 

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1; 

OPEN cur; 

REPEAT 

FETCH cur INTO va1; 

IF NOT done THEN 

SET result = result +va1; 

END IF: 

UNTIL done END REPEAT; 

SELECT result; 

END 

CALL sum_t1(); 

What is the result of the CALL statement? 

A. The procedure completes, and 15 is returned 

B. The procedure’s IF condition is not satisfied, and 0 is returned. 

C. The procedure’s loop is not entered, and 1 is returned. 

D. An infinite loop will be running until the command is killed. 

Answer:


Q3. Which three are valid identifiers for the user table in the mysq1 database? 

A. myssq1. user 

B. ‘mysq1. user’ 

C. ‘mysq1’. ‘user’ 

D. Mysq1. ‘user’ 

E. ‘’mysq1. User’’ 

Answer: A,C,D 


Q4. Cormcctor/Net supports a decoupled database connection mode, where a database Connection is established only when needed. 

Choose the three parts that are involved when working with decoupled data. 

A. OpenConnect.MySql, DataTTiread.MySql, CommandExecutor.MySql 

B. MySqlQueryBuIld, MySqlQuerytxer. MySq I Query Results 

C. DecoupODBCConn, DecoupMyScjlruiiimanrt, DecoupMySqlRetum 

D. DataSet, MySqlDataAdapter, MySql Command Builder 

Answer:

Reference:http://dev.mysql.com/doc/connector-net/en/connector-net-tutorials-data-adapter.html 


Q5. You wish to create a trigger on the ‘city’ table that will check the value of the ‘District’ field before any INSERT. The trigger needs to change it to” Unknown” for an empty string or NULL. 

CREATE TRIGGER City_bi 

BEFORE INSERT ON CITY 

FOR EACH ROW 

BEGIN 

IF OLD. District IS NULL OR OLD.District= . . 

THEN 

SET NEW.District=’Unknown’; 

END IF : 

END; 

Does the CREATE TRIGGER statement accomplish this goal? 

A. Yes; the trigger works correctly. 

B. No; FOR EACH ROW is invalid syntax. 

C. No; the syntax should be CREATE TRIGGER city-bi ON city BEFORE INSERT…. 

D. No; the OLD keyword cannot be used in an INSERT trigger. 

Answer:


Most recent 1Z0-882 exam topics:

Q6. Which statement is true about the difference between HASH and BTREE INDEXES? 

A. HASH indexes support rightmost prefixing of keys, which makes them faster than BTREE indexes in many causes. 

B. HASH indexes can be used by the optimizer to speed up ORDER BY operations and not BTREE indexes. 

C. HASH indexes are used only for equality comparisons (= or<=>),whereas BTREE indexes can also be used for range searches (>or<). 

D. HASH indexes are much faster than BTREE indexes but can only be used for a single column. 

Answer:

Reference:https://devcenter.heroku.com/articles/postgresql-indexes 


Q7. Inspect the query: 

Mysql>SELECT dept_no, emp_no FROM employees JOIN dept _manager USING(emp_no) WHERE dept_no’d004’; 

4 rows in set (0.00 sec) 

Mysql>EXPLAIN SELECT dept_no, emp_no FROM employees JOIN dept_manager USING (emp_no) WHERE dept_no=’d004’; 

2 rows in set (0.00 sec) 

Which two statements are true about the EXPLAIN output? 

A. All data for the result is read from the indexex. 

B. The PRIMARY KEY is used for filtering in both tables. 

C. The minimal number of rows possible are read. 

D. The dept_manager table has 4 times as many rows than the employees table. 

Answer:


Q8. 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 

Answer:


Q9. A SELECT statement without an ORDER BY clause return some rows. 

Which statement is always true about the order of the returned results? 

A. The results are in ascending order. 

B. The results are in descending order. 

C. The results are in the order inserted. 

D. The results are not in a set order. 

Answer:

Reference: http://www.postgresql.org/docs/8.2/static/sql-select.html#SQL-ORDERBY 


Q10. You have access to a MySQL 5.6 database with the SELECT ,INSERT, and DELETE privileges on all tables in the mydb database. 

The mydb database. 

The mydb t1 table has five rows of data. 

You use the statement below to remove all rows in the t1 table: 

Mysql> TRUNCATE TABLE mysql.t1; 

What is the result? 

A. The command succeeds and o rows are affected. 

B. The command succeeds and five rows are affected. 

C. The command fails owing to syntax error. 

D. The command fails owing to permissions error. 

Answer: