Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

501.

Which statement is used to determine the storage engine for individual tables?(a) SHOW TABLE STATUS(b) SHOW DEFAULT STATUS(c) SHOW STATUS OF TABLE(d) SHOW STATUS TABLE

Answer» Right choice is (a) SHOW TABLE STATUS

The best I can explain: MySQL provides a method to determine the storage engine for each table with the ‘SHOW TABLE STATUS’ statement. The output of this statement is the name of the storage engine indicator.
Discussion
502.

When the security context enables carefully written stored programs to be set up that provide controlled access to tables for users, it is called __________(a) good(b) bad(c) illegal(d) fare

Answer» Correct choice is (a) good

Explanation: The security context is good if it enables carefully written stored programs to be set up that provide controlled access to tables for users who are not able to access them directly.
Discussion
503.

Which type can store a collection of objects of any type?(a) GEOMETRYCOLLECTION(b) MULTIPOINT(c) MULTILINESTRING(d) MULTIPOLYGON

Answer» The correct answer is (a) GEOMETRYCOLLECTION

Explanation: ‘GEOMETRYCOLLECTION’ can store a collection of objects of any type. The other collection types like ‘MULTIPOINT’, ‘MULTILINESTRING’, ‘MULTIPOLYGON’ and ‘GEOMETRYCOLLECTION’ restrict collection members to those having a particular geometry type.
Discussion
504.

Which mode prevents MySQL to perform full checking of date parts?(a) PREVENT_DATE_CHECK(b) STOP_DATES_CHECK(c) ALLOW_DATES_INVALID(d) ALLOW_INVALID_DATES

Answer» The correct answer is (d) ALLOW_INVALID_DATES

To elaborate: In MySQL, it is also possible to selectively weaken the strict mode in some places. If the ALLOW_INVALID_DATES SQL mode is enabled, MySQL doesn’t perform full checking of the date parts.
Discussion
505.

The datatype INT stores ___________(a) 16 bit(b) 32 bit(c) 48 bit(d) 64 bit

Answer» Right choice is (b) 32 bit

Easiest explanation: Numeric datatypes in MySQL are many. Each numeric datatype used in MySQL have their own ranges in terms of bits. The INT datatype stores signed and unsigned values of 32 bits.
Discussion
506.

The datatype that stores the longest length of strings is ______________(a) CHAR(b) VARCHAR(c) TINYTEXT(d) TEXT

Answer» Right option 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
507.

If a column is expected to store values up to 2 million, the best datatype for it is _____________(a) SMALLINT(b) TINYINT(c) MEDIUMINT(d) BIGINT

Answer» The correct choice is (d) BIGINT

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
508.

What is the best datatype for a column that is expected to store values up to 2 million?(a) SMALLINT(b) TINYINT(c) MEDIUMINT(d) BIGINT

Answer» Right option is (d) BIGINT

For explanation I would say: The different numeric types used in MySQL are used to store a different range of values. To store values of the order of a million, the MEDIUMINT or BIGINT datatype is sufficient.
Discussion
509.

What does the AUTO_INCREMENT sequences normally begin at?(a) 0(b) 1(c) -1(d) 2

Answer» Right choice is (b) 1

To elaborate: The AUTO_INCREMENT column attribute provides unique numbers for column identification. AUTO_INCREMENT sequences normally begin at 1 and increase monotonically like 1, 2, 3, and so on.
Discussion
510.

Suppose the last row has the AUTO_INCREMENT column value 32. Suppose a new row is added by setting AUTO_INCREMENT value equal to 100. The next row added will have value _____________(a) 32(b) 33(c) 100(d) 101

Answer» Correct option is (d) 101

To elaborate: If the new value is larger than the current next sequence number, then the sequence is reset to continue with the next value after that for the following rows. In this way, “bumping up” the counter is done.
Discussion
511.

What does LAST_INSERT_ID() return when no AUTO_INCREMENT value has been generated during the current connection?(a) -1(b) 0(c) 1(d) 2

Answer» Right answer is (b) 0

Explanation: The ‘LAST_INSERT_ID()’ function returns zero when no ‘AUTO_INCREMENT’ value has been generated during the current connection with the server. It is tied to the current connection.
Discussion
512.

When no AUTO_INCREMENT value has been generated during the current connection, LAST_INSERT_ID() returns ____________(a) -1(b) 0(c) 1(d) 2

Answer» Right choice is (b) 0

Easy explanation: The ‘LAST_INSERT_ID()’ function returns zero when no ‘AUTO_INCREMENT’ value has been generated during the current connection with the server. It is tied to the current connection.
Discussion
513.

What does the AUTO_INCREMENT sequences begin at by default?(a) 0(b) 1(c) -1(d) 2

Answer» The correct choice is (b) 1

To explain: The AUTO_INCREMENT column attribute provides unique numbers for column identification. AUTO_INCREMENT sequences normally begin at 1 and increase monotonically like 1, 2, 3, and so on.
Discussion
514.

In a MyISAM table, if the maximum value of an AUTO_INCREMENT increment column is 12 and that row is deleted, the next value generated is _____________(a) 12(b) 13(c) 1(d) 14

Answer» Right answer is (b) 13

The explanation: In the MyISAM tables, AUTO_INCREMENT sequences normally are monotonic. The values in an automatically generated series are strictly increasing. They are not reused when rows are deleted.
Discussion
515.

The AUTO_INCREMENT column attribute is best used with ______________(a) FLOAT(b) INT(c) CHARACTER(d) DOUBLE

Answer» The correct option is (b) INT

The explanation is: The AUTO_INCREMENT is a column attribute and it is best used with the integer datatypes. It automatically assigns monotonically increasing values to the AUTO_INCREMENT columns.
Discussion
516.

The AUTO_INCREMENT column attribute is best used with which type?(a) FLOAT(b) INT(c) CHARACTER(d) DOUBLE

Answer» Correct answer is (b) INT

The explanation: The AUTO_INCREMENT is a column attribute and it is best used with the integer datatypes. It automatically assigns monotonically increasing values to the AUTO_INCREMENT columns.
Discussion
517.

For which type are illegal values converted to the appropriate ‘zero’ value?(a) Numeric(b) String(c) ENUM(d) TIME

Answer» Correct choice is (d) TIME

The best explanation: In MySQL, there are different ways to handle the illegal values for different datatypes for default. For date or time columns, illegal values are converted to the appropriate “zero” value for the type.
Discussion
518.

Which of the following characters is illegal in naming an unquoted identifier in SQL?(a) _(b) $(c) 2(d) .

Answer» The correct choice is (d) .

Explanation: An identifier is used to refer to a database or its elements. These elements can be entire tables or attributes. The names of these identifiers follow some set of rules, so they have a set of legal characters.
Discussion
519.

Which of the following is an illegal unquoted identifier name?(a) 123_id(b) 123id(c) id1(d) 123

Answer» Correct option is (d) 123

Explanation: In MySQL, the quoted and unquoted identifier names have differences in the level of restrictions imposed on them. An unquoted identifier name can’t have all digits since it would be impossible to distinguish it from an integer constant.
Discussion
520.

Illegal values converted to the appropriate ‘zero’ value for ______________(a) Numeric(b) String(c) ENUM(d) TIME

Answer» The correct answer is (d) TIME

The best I can explain: In MySQL, there are different ways to handle the illegal values for different datatypes for default. For date or time columns, illegal values are converted to the appropriate “zero” value for the type.
Discussion
521.

If ANSI_QUOTES is enabled, MySQL treats the double quotes as ________________(a) identifier-quoting character(b) string-quoting character(c) hexadecimal(d) string

Answer» Right option is (a) identifier-quoting character

Easiest explanation: The SQL standard specifies the single quotes so that statements are portable across database engines. If ANSI_QUOTES is enabled, MySQL treats the double quotes as identifier-quoting character.
Discussion
522.

Which mode tells the server to recognize double quote as an identifier quoting character?(a) ANSI_DQ(b) ANSI_QUOTES(c) ANSI_RECG_QUOTES(d) ANSI_RECG_DQUOTES

Answer» Right option is (b) ANSI_QUOTES

The explanation: ‘ANSI_QUOTES’ is the MySQL server mode value stored in the system variable which directs the MySQL server to treat the double quote character as a quoting character for identifiers. The others are not valid mode values.
Discussion
523.

What is the maximum non zero values for DOUBLE?(a) ±1.7976931348623157E+307(b) ±1.7976931348623157E+308(c) ±1.7976931348623157E+306(d) ±1.7976931348623157E+305

Answer» Correct option is (b) ±1.7976931348623157E+308

To explain I would say: In MySQL, all the datatypes have their own ranges. Data types give an idea of the kind of values and the ranges that a variable is allowed to store. The maximum non zero value for DOUBLE is ±1.7976931348623157E+308.
Discussion
524.

What is the maximum non zero value for FLOAT?(a) 3.402823466E+38(b) 3.402823466E+37(c) 3.402823466E+39(d) 3.402823466E+35

Answer» Right option is (a) 3.402823466E+38

Explanation: In MySQL, each datatype has its own range. Data types give an idea of the kind of values and the ranges that a variable is allowed to store. The maximum non zero value for FLOAT is 3.402823466E+38.
Discussion
525.

The maximum non zero value for FLOAT is ______________(a) 3.402823466E+38(b) 3.402823466E+37(c) 3.402823466E+39(d) 3.402823466E+35

Answer» Correct choice is (a) 3.402823466E+38

The best I can explain: In MySQL, each datatype has its own range. Data types give an idea of the kind of values and the ranges that a variable is allowed to store. The maximum non zero value for FLOAT is 3.402823466E+38.
Discussion
526.

The maximum non zero value for FLOAT is ___________(a) 3.402823466E+38(b) 3.402823466E+37(c) 3.402823466E+39(d) 3.402823466E+35

Answer» Correct option is (a) 3.402823466E+38

For explanation: In MySQL, each datatype has its own range. Data types give an idea of the kind of values and the ranges that a variable is allowed to store. The maximum non zero value for FLOAT is 3.402823466E+38.
Discussion
527.

Which among the following are the correct representation of “float(4,2)”?(a) 24.33(b) 124.4(c) 12.123(d) Both 24.33 and 124.4

Answer» Correct answer is (d) Both 24.33 and 124.4

To explain I would say: Float(4,2) allowed at most 2 digit at right of the decimal and left of the decimal.
Discussion
528.

What will be the storage pattern for “float(4,2)” in Mysql?(a) Total of four digits, two to the left of decimal and two to the right of decimal(b) Total of six digits(c) Total of four digits, not distributed uniformly(d) None of the mentioned

Answer» Correct option is (a) Total of four digits, two to the left of decimal and two to the right of decimal

Explanation: As per standards.
Discussion
529.

The option used to specify the socket file pathname is ______________(a) –socket(b) –pathtosocket(c) –path_socket(d) –socket_pathfile

Answer» Correct option is (a) –socket

Explanation: The default socket file usually is ‘/tmp/mysql.sock’. Operating system distributions that include MySQL often use a different location. The –socket option is used to specify explicitly.
Discussion
530.

What enables encrypted connections to be established?(a) exec_stmt_ssl(b) exec_ssl_stmt(c) exec_stmnt_ssl(d) exec_ssl_stmnt

Answer» The correct option is (a) exec_stmt_ssl

Easiest explanation: For the ‘exec_stmt_ssl’ to work properly, MySQL must have been built with SSL support, and the server must be started with the proper options that identify its certificate and key files.
Discussion