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Q21. In MYSQL 5.6 you have the table t1: CREATE TABLE t1 (
id int unsigned NOT NULL PRIMARY key) ENGINE = InnoDB; There are two connections to the server. They execute in this order:
Connection 1> SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
Connection 1> START TRANSACTION;
Connection 1> SELECT * FROM t1 WHERE id =1; Connection 2> TRUNCATE TABLE t1;
What happens to the TRUNCATE TABLE command in connection 2?
A. It immediately proceeds and causes an implicit commit of the transaction in connection1.
B. It runs concurrently with the transaction in connection 1 as each connection has its own view of the data in the t1 table.
C. It blocks waiting for a metadata lock until the transaction in connection 1 ends.
D. It blocks waiting for a table lock until the transaction in connection 1 ends.
Q22. Which three statement types can be prepared?
A. LOAD DATA INFILE
B. CREATE TABLE
C. CREATE VIEW
D. ALTER VIEW
Q23. 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
Q24. A table (t1) contains 1000 random integer values in the first column (col1). The random values range from 1 to 1000.
You execute this query:
SELECT col1 FROM t1 WHERE col1< 100 UNION
SELECT col1 FROM t1 WHERE col1 BETWEEN 100 and 200
SELECT col1 FROM t1 WHERE col 1 >=900
What is the output?
A. A list of unique values within the ranges of 1-200 and 900-1000
B. A list of unique values within the range of 1-200 and a list of all values, including duplicates, on the table within the range of 900-1000
C. A list of all values , including duplicates, in the range of 1-200 and a list of unique values in the range of 900-1000
D. A list of all values, including duplicates, in the ranges of 1-200 and 900-1000
E. An error, because mixing UNION and UNION ALL in the same query is not permitted
Q25. Which three database objects have non-case-sensitive names on all operating system?
D. Stored procedure
Q26. A MySQL command- line client is started with safe updates disabled. Mysql - -safe – updates=0
What happens when you execute an UPDATE statement without a WHERE clause?
A. Results in an error
B. Updates every row in the specified table(s)
C. Results in - -safe-updates being enabled automatically
D. Causes a syntax error
Q27. 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
Q28. 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.