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1.

The MySQL server is configurable.(a) True(b) FalseThe question was asked at a job interview.This is a very interesting question from Secure Connections in portion Nulls and Conditions and Miscellaneous of MySQL

Answer» RIGHT choice is (a) True

Best explanation: The MySQL server is highly configurable. Some of the OPERATIONAL characteristics that you can CONTROL include which storage engines the server supports, the DEFAULT character set, and its default time zone.
Discussion
2.

Is the following statement is true/false?(a) “An expression can be NULL,but can never equal to NULL”(b) True(c) FalseThe question was asked in an online quiz.The above asked question is from Null: the Four Letter Word in division Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT choice is (a) “An expression can be NULL,but can NEVER equal to NULL”

For EXPLANATION: NONE.
Discussion
3.

Which among the following operators is/are belongs to “Equality conditions”?(a) (b) !=(c) =(d) >/

Answer» RIGHT ANSWER is (C) =

The EXPLANATION: NONE.
Discussion
4.

Select odd one out?(a) Equality Conditions(b) Inequality Conditions(c) Range condition(d) BetweenI have been asked this question in an internship interview.The above asked question is from Condition Types topic in section Nulls and Conditions and Miscellaneous of MySQL

Answer»

Correct ANSWER is (d) Between

Explanation: “Between” is an OPERATOR while OTHERS are CONDITIONS types.
Discussion
5.

Which of the following statements is/are correct?(a) True OR true =true(b) True OR false= true(c) False OR false= false(d) All of the mentionedI got this question in my homework.This question is from Conditional Evaluation in division Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT CHOICE is (d) All of the mentioned

To ELABORATE: NONE.
Discussion
6.

What is the TLS protocol?(a) transparent layer security(b) transport layer security(c) transparent level security(d) transport level securityI had been asked this question in an interview for job.The query is from Secure Connections in section Nulls and Conditions and Miscellaneous of MySQL

Answer»

The correct choice is (b) transport layer security

Easy explanation: MYSQL SUPPORTS encrypted connections between CLIENTS and the server using the TLS protocol. It is ALSO referred to as SSL but MySQL does not actually use the SSL protocol for encrypted connections.
Discussion
7.

The number of files that each end of a client/server connection including SSL support use to set up secure communications is __________(a) 0(b) 1(c) 2(d) 3The question was posed to me by my college director while I was bunking the class.Question is taken from Secure Connections in section Nulls and Conditions and Miscellaneous of MySQL

Answer»

The CORRECT CHOICE is (d) 3

The best I can explain: With a MySQL installation that includes SSL support the server and its CLIENTS can communicate securely. Each end of a CONNECTION uses three files to set up secure COMMUNICATIONS.
Discussion
8.

Is the following statement is true/false?(a) “Two NULL values are equal to each other”(b) True(c) FalseThis question was addressed to me by my school principal while I was bunking the class.This interesting question is from Null: the Four Letter Word topic in division Nulls and Conditions and Miscellaneous of MySQL

Answer»

The correct answer is (B) True

The best I can EXPLAIN: NONE.
Discussion
9.

Which operator is used to check the expression is not “NULL”?(a) IS NULL(b) NOT NULL(c) ON(d) None of the mentionedThis question was addressed to me during an online exam.Asked question is from Null: the Four Letter Word topic in section Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT answer is (b) NOT NULL

The BEST explanation: NONE.
Discussion
10.

What is the meaning of “NULL” in Mysql?(a) Not applicable(b) Value not yet known(c) Value undefined(d) All of the mentionedI got this question during an interview.My doubt stems from Null: the Four Letter Word in portion Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT OPTION is (d) All of the mentioned

Explanation: NONE.
Discussion
11.

Which of the following statements is/are correct?(a) NOT(true AND true) =false(b) NOT(false AND false)=true(c) NOT (true AND false)= true(d) All of the mentionedI got this question in my homework.Question is taken from Conditional Evaluation topic in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer»

The CORRECT OPTION is (d) All of the mentioned

For EXPLANATION: NONE.
Discussion
12.

Which of the following statements is/are correct?(a) NOT(true)=false(b) NOT(false)=true(c) Both NOT(true)=false and NOT(false)=true(d) None of the mentionedThis question was posed to me during an online exam.This is a very interesting question from Conditional Evaluation in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer»

Correct option is (c) Both NOT(true)=FALSE and NOT(false)=true

For EXPLANATION: NONE.
Discussion
13.

The function that returns a reference to an array of row values is ______________(a) fetchrow_array()(b) fetchrow_arrayref()(c) fetch()(d) fetchrow_hashref()I got this question during an interview for a job.The question is from Secure Connections topic in portion Nulls and Conditions and Miscellaneous of MySQL

Answer» RIGHT option is (b) fetchrow_arrayref()

Easiest explanation: ‘fetchrow_arrayref()’ returns a reference to an ARRAY of ROW VALUES. The function ‘fetchrow_hashref()’ returns reference to HASH of row values. ‘fetch()’ is the same as fetchrow_arrayref().
Discussion
14.

Which operator is used to check whether the expression is “NULL”?(a) IS NULL(b) NOT NULL(c) ON(d) None of the mentionedI had been asked this question during an interview.This intriguing question comes from Null: the Four Letter Word topic in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer»

The CORRECT CHOICE is (a) IS NULL

The EXPLANATION: NONE.
Discussion
15.

Which of the following operators is/are used in “Condition Evaluation”?(a) AND(b) OR(c) NOT(d) All of the mentionedThis question was addressed to me by my college director while I was bunking the class.I want to ask this question from Conditional Evaluation in section Nulls and Conditions and Miscellaneous of MySQL

Answer»

The CORRECT OPTION is (d) All of the mentioned

Easy EXPLANATION: NONE.
Discussion
16.

The log in which data changes received from a replication master server are written is _____________(a) error log(b) general query log(c) binary log(d) relay logThe question was posed to me during an interview.The origin of the question is Secure Connections topic in portion Nulls and Conditions and Miscellaneous of MySQL

Answer»

Correct option is (d) relay log

The explanation is: The Relay Log has the data CHANGES received from a replication MASTER server written in it. The PROBLEMS encountered during the STARTING, running or stopping of ‘mysqld’ are written in error log.
Discussion
17.

What is the meaning of “Range Conditions”?(a) Expression is equal to Expression(b) Expression is not equal to Expression(c) Expression fall under certain range(d) None of the mentionedI got this question in an internship interview.I want to ask this question from Condition Types topic in division Nulls and Conditions and Miscellaneous of MySQL

Answer»

Right CHOICE is (c) Expression FALL under CERTAIN range

To explain: None.
Discussion
18.

What is the meaning of “Equality Conditions”?(a) Equal to(b) Not equal to(c) Both Equal to and Not equal to(d) None of the mentionedI got this question in exam.This interesting question is from Condition Types in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT CHOICE is (a) EQUAL to

Explanation: NONE.
Discussion
19.

Which grant table scope columns are case insensitive?(a) Host(b) User(c) Password(d) DbI got this question in unit test.I would like to ask this question from Secure Connections topic in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer» RIGHT choice is (a) Host

To elaborate: ‘Db’ and ‘Table_name’ VALUES are always TREATED as case sensitive even though the TREATMENT of database and table names in SQL statements depends on the FILESYSTEM case sensitivity of the host.
Discussion
20.

Which among the following operators is/are belongs to “Inequality conditions”?(a) (b) !=(c) =(d) Both and !=The question was posed to me during an internship interview.My question comes from Condition Types topic in division Nulls and Conditions and Miscellaneous of MySQL

Answer»

Right answer is (d) Both <> and !=

To elaborate: NONE.
Discussion
21.

The security context when a user creates a stored program that accesses sensitive data but forgets that other people who can invoke the object have the same access is __________(a) bad(b) good(c) fare(d) illegalI have been asked this question in an online quiz.I need to ask this question from Database Copies in portion Nulls and Conditions and Miscellaneous of MySQL

Answer»

Correct choice is (a) bad

The explanation is: The security context is bad if a USER CREATES a stored program that accesses sensitive data but forgets that other PEOPLE who can INVOKE the object have the same ACCESS to that data as its definer.
Discussion
22.

The function that returns reference to hash of row values is ____________(a) fetchrow_array()(b) fetchrow_arrayref()(c) fetch()(d) fetchrow_hashref()I got this question by my school teacher while I was bunking the class.I want to ask this question from Database Copies topic in section Nulls and Conditions and Miscellaneous of MySQL

Answer»

The correct answer is (d) fetchrow_hashref()

Best EXPLANATION: The function ‘fetchrow_hashref()’ returns REFERENCE to hash of row VALUES. ‘fetchrow_arrayref()’ returns a reference to an array of row values. ‘FETCH()’ is the same as fetchrow_arrayref().
Discussion
23.

Which privileges are required on the source server to use mysqldbcopy?(a) CREATE(b) INSERT(c) UPDATE(d) SELECTI have been asked this question in an internship interview.Asked question is from Database Copies in section Nulls and Conditions and Miscellaneous of MySQL

Answer»

Right answer is (d) SELECT

Easy explanation: To USE the utility PROGRAM ‘mysqldbcopy’, the user must have SELECT privileges for the database(s) on the source server and have CREATE, INSERT, UPDATE on the destination server.
Discussion
24.

Which of the following statements is/are correct?(a) NOT(true OR true) = false(b) NOT(false OR false)= true(c) NOT (true OR false)= false(d) All of the mentionedI have been asked this question during a job interview.I would like to ask this question from Conditional Evaluation in portion Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT CHOICE is (d) All of the mentioned

Best EXPLANATION: NONE.
Discussion
25.

The variable that checks for availability of SSL support is ____________(a) have_ssl(b) has_ssl(c) avail_ssl(d) ssl_availThe question was asked in an internship interview.The doubt is from Secure Connections in portion Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT option is (a) have_ssl

Explanation: After the SSL-capable SERVER is started, to verify that it supports SSL, connection is established with ‘MYSQL’ and the FOLLOWING query is issued: SHOW VARIABLES LIKE ‘have_ssl’.
Discussion
26.

The best datatype for a column that is expected to store values up to 2 million is _________(a) SMALLINT(b) TINYINT(c) MEDIUMINT(d) BIGINTI had been asked this question in a national level competition.My doubt is from Database Copies topic in portion Nulls and Conditions and Miscellaneous of MySQL

Answer»

The correct choice is (d) BIGINT

The best explanation: The DIFFERENT numeric types used in MySQL are used to STORE different range of VALUES. To store values of the order of a MILLION, the MEDIUMINT or BIGINT datatype is sufficient.
Discussion
27.

MySQL does provides a date type that has an optional time part.(a) True(b) FalseI had been asked this question during an interview.Asked question is from Secure Connections in portion Nulls and Conditions and Miscellaneous of MySQL

Answer»

Correct option is (a) True

To EXPLAIN I would SAY: In MySQL, there is no data type provided which has an optional time part. The ‘DATE’ type VALUES never have a time part. The ‘DATETIME’ type values must have a time part in them.
Discussion
28.

Which option is used in mysqldump to make all tables in the destination databases to use a different storage engine?(a) –next-storage-engine(b) –new-storage-engine(c) –clear-storage-engine(d) –get-storage-engineThis question was addressed to me in exam.The query is from Database Copies in division Nulls and Conditions and Miscellaneous of MySQL

Answer»

Right answer is (b) –new-storage-engine

Easy explanation: While using the program ‘mysqldump’ in MySQL to copy databases from server to server, all TABLES in the DESTINATION databases can be DIRECTED to USE a different storage engine with the –new-storage-engine OPTION.
Discussion
29.

Which among the following operators is/are belongs to “Range conditions”?(a) (b) !=(c) =(d) >/

Answer» CORRECT CHOICE is (d) >/<

The explanation is: None.
Discussion
30.

Which among the following data types can be used with “Range Condition”?(a) Numeric data type(b) Temporal data type(c) String data type(d) Both Numeric and Temporal data typeThis question was posed to me in an internship interview.The above asked question is from Condition Types in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer»

Right CHOICE is (d) Both Numeric and Temporal DATA type

Best EXPLANATION: None.
Discussion
31.

Which of the following statements is/are correct?(a) True AND true =true(b) True AND false= false(c) False AND false= false(d) All of the mentionedThis question was addressed to me in exam.The question is from Conditional Evaluation in portion Nulls and Conditions and Miscellaneous of MySQL

Answer»

The CORRECT OPTION is (d) All of the mentioned

Easy EXPLANATION: NONE.
Discussion
32.

Which type stores the longest length of strings?(a) CHAR(b) VARCHAR(c) TINYTEXT(d) TEXTI have been asked this question in an interview.The above asked question is from Database Copies topic in portion Nulls and Conditions and Miscellaneous of MySQL

Answer» CORRECT answer is (d) TEXT

To elaborate: in MySQL, the different string datatypes are used to store different LENGHTS of the string. Here, the length would REFER to the number of characters in the string. TEXT stores longer STRINGS.
Discussion
33.

The program that copies the databases from one server to another is ____________(a) mysqldbcopy(b) mysqlcopydb(c) mysqlflushdb(d) mysqldbflushI had been asked this question in an international level competition.My question comes from Database Copies topic in portion Nulls and Conditions and Miscellaneous of MySQL

Answer»

Right OPTION is (a) mysqldbcopy

To explain I WOULD say: The utility program ‘mysqldbcopy’ is capable of copying databases from one server to another server. It can also prepare copies to make TRANSFERS on the same servers. This can be done SIMPLY by RUNNING the program.
Discussion
34.

What is the meaning of “Inequality Condition”?(a) Not equal to(b) Equal to(c) Both Not equal to and Equal to(d) None of the mentionedI have been asked this question in homework.This interesting question is from Condition Types topic in chapter Nulls and Conditions and Miscellaneous of MySQL

Answer» RIGHT OPTION is (a) Not EQUAL to

For explanation I WOULD say: None.
Discussion