A To Z Exams

What is DML?

Data Maintained Language

Data mandatory Language

Data manipulation Language

Defined manipulation Language

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?

SELECT * FROM Persons WHERE FirstName='%a%'

SELECT * FROM Persons WHERE FirstName LIKE '%a'

SELECT * FROM Persons WHERE FirstName='a'

SELECT * FROM Persons WHERE FirstName LIKE 'a%'

SELECT * FROM Persons WHERE FirstName='a'"

What type of lock will deny users any access to a table?

EXPLICIT

IMPLICIT

EXCLUSIVE

Shared

READ ONLY

A table may be joined to itself.

True

false

No joing concepts in the table.

On executing DELETE command, if you get an error "foreign key constraint" what does it imply?

Foreign key not defined

Table is empty

Connectivity issue

Data is present in the other table

An outer join requires each record in the two joined tables to have a matching record.

True

False

None

Both

With SQL, how do you select all the records from a table named "Persons" where the "LastName" is alphabetically between (and including) "Hansen" and "Pettersen"?

SELECT LastName>'Hansen' AND LastName

SELECT * FROM Persons WHERE LastName BETWEEN 'Hansen' AND 'Pettersen'

SELECT * FROM Persons WHERE LastName>'Hansen' AND LastName

Which command is used for showing current date and time in Mysql command line tool?

select now()

SELECT now();

SELECT now()

None of these

Which of the following is not a character manipulation function?

concat

substr

instr

coalesce

Which of the following can add a row to a table?

Add

Insert

Update

Alter

With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?

SELECT * FROM Persons SORT BY 'FirstName' DESC

SELECT * FROM Persons ORDER BY FirstName DESC

SELECT * FROM Persons ORDER FirstName DESC

SELECT * FROM Persons SORT 'FirstName' DESC

The “Mysql command line tool” formats are bounded by

+-|

+-*

+-/

+-}

In a LIKE clause, you can ask for any 6 letter value by writing?

LIKE ??????

LIKE .{6} Answer 5: LIKE ^.{6}$

LIKE ...... (that's six dots)

LIKE ______ (that's six underscore characters)

MySQL is

A Programming language

A technique for writing reliable programs

A Relational Database Management System

How is structure of a table got in MySQL?

"show create table table_name";

"show insert table table_name";

"select table table_name";

"show update table table_name";

In PHP in order to access MySQL database you will use:

mysqlconnect() function

mysql-connect() function

mysql_connect() function

sql_connect() function

What is DCL?

Data Control Language

Data Content Language

Data Column Language

Defined Control Language

How many distinct, different values can you hold in an enum field?

255

65535

2 (True and False)

If you're writing a client using the C language API, your source code should include the following line at the top:

use mysql;

include ("mysql.h");

#include

import com.mysql.*;

A NULL value is treated as a blank or 0.

True

Fasle

None of the above

Can I define multiple unique constraints on a table?

Yes

What's the difference between the DESCRIBE and SHOW FIELDS FROM commands?

Only SHOW FIELDS FROM can take a LIKE clause

Nothing - they're the same thing

Only DESCRIBE can take a LIKE clause

How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?

UPDATE Persons SET LastName='Hansen' INTO LastName='Nilsen'

UPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'

MODIFY Persons SET LastName='Hansen' INTO LastName='Nilsen

MODIFY Persons SET LastName='Nilsen' WHERE LastName='Hansen'

Which SQL keyword is used to sort the result-set?

SORT

ORDER BY

ORDER

SORT BY

What is a candidate key?

Used to uniquely identify a row

Alias for primary key

Used to identify a column

Alias for foreign key

Given an employees table as follows: emp_id emp_name 1 Brush 2 Jerrin what value will be return by below query ? Select count(*) from employees

none of the above

Which of these is not a valid name for a column

From

Far

Near

Enum values are stored according to their index numbers

True

False

How do I find out all databases starting with ‘test to which I have access to?

SHOW DATABASES LIKE ‘%test%’;

SHOW DATABASES LIKE ‘%test;

SHOW DATABASES LIKE ‘'test'%’;

SHOW DATABASES LIKE ‘test%’;

What MySQL property is used to create a surrogate key in MySQL?

UNIQUE

SEQUENCE

Surrogate keys are not implemented in MySQL.

AUTO_INCREMENT

How to view all Triggers in MySQL?

Show triggers;

Display triggers;

select triggers;

view triggers;

MySQL Access security is controlled through?

The ID that the user logged into the server through, and priveliges set up for that account.

MySQL login accounts, and priveliges set for each account

The normal login security is sufficient for MySQL, and it does not have any extra controls of its own.

A table of valid IP addresses, and priveliges set up for each IP address

________ is an open source DBMS product that runs on UNIX, Linux and Windows.

MySQL

JSP/SQL

JDBC/SQL

Sun ACCESS

The “Mysql command line tool” format the results in which of the following format:

Rectangle

Square

Sphere

None of these

What does the DESC keyword do in the following query? SELECT * FROM MY_TABLE WHERE ID > 0 ORDER BY ID, NAME DESC

It causes the dataset returned by the query to be sorted in descending order

It causes rows with the same ID to be sorted by NAME in ascending order

It causes rows with the same ID to be sorted by NAME in descending order

It causes rows to be sorted by NAME first and then by ID

It causes the result set to include a description of the NAME field

The result of a SELECT statement can contain duplicate rows.

False

True

None of the above

Can DISTINCT command be used for more than one column?

Yes

Which of the following is not a valid aggregate function?

COUNT

MIN

MAX

COMPUTE

With SQL, how do you select a column named "FirstName" from a table named "Persons"?

EXTRACT FirstName FROM Persons

SELECT FirstName FROM Persons

SELECT Persons.FirstName

Which of the following is not an SQL aggregate function?

AVG

SUM

MIN

MAX

CURRENT_DATE

You are required to buy a license for MySQL if

If you use it for longer than 30 days

You use MySQL in a live application and not just for evaluation

You incorporate it into a product that you sell

You use it on a publicly accessible site

You are never required to buy a license

The "father" of MySQL is

Michael Widenius

Stephanie Wall

Sigmund Velin

Bill Joy

mysql_pconnect() is used to make a persistent connection to the database which means a SQL link that do not close when the execution of your script ends.

True

False

User() fucntion returns the current users user name and ___________

password

host name

both a and b above

database name associated with the user

MySql | Which of the following is available in MySQL:

CREATE TRIGGER

CREATE SCHEMA

CREATE FAIRYLIGHTS

CREATE DATABASE

CREATE VIEW

When do we use a HAVING clause?

To limit the output of a query

To limit the output of a query using an aggregate function only

When GROUP by is used

both b and c above

Which one will delete the table data as well as table structure?

TRUNCATE

DROP

How many TRIGGERS are allowed in MySql table?

A user with RELOAD priveliges can

Can reset passwords for any mysql user account

Perform certain "admin type" operations such as flush table and logs from memory to disc, but can't normally do anything "dangerous"

Can repopulate the databases and tables from a backup

Can restart the MySQL daemon in addition to any other priveliges he might also have

What is Row?

A row is a unit of data with related data items stored as one item in multiple columns in a table

A row is a unit of data with related data items stored as multiple item in one column in a table

A row is a unit of data with related data items stored as one item in two columns in a table

A row is a unit of data with related data items stored as one item in one column in a table

BLOB data type can have default column value.

True

False

MySQL supports the complete SQL99 standard

false

true

SQL is not case sensitive. SELECT is the same as select.

True

False

Which statement is used to access an existing Database?

Use

use database.name

USE databasename;

none of these

Which of the following DBMSs do not have a native PHP extension?

MySQL

IBM DB/2

PostgreSQL

Microsoft SQL Server

None of the above

A view is nothing but a ________ table or a stored query

Dymanic

Real

Virtual

Static

With SQL, how can you insert "Olsen" as the "LastName" in the "Persons" table?

INSERT INTO Persons (LastName) VALUES ('Olsen')

INSERT ('Olsen') INTO Persons (LastName)

INSERT INTO Persons ('Olsen') INTO LastName

With SQL, how can you insert a new record into the "Persons" table?

INSERT INTO Persons VALUES ('Jimmy', 'Jackson')

INSERT ('Jimmy', 'Jackson') INTO Persons

INSERT VALUES ('Jimmy', 'Jackson') INTO Persons

The USE command?

Is used to load code from another file

Has been deprecated and should be avoided for security reasons

Is a pseudonym for the SELECT command

Should be used to choose the database you want to use once you've connected to MySQL

Which authentications are required for login into Mysql command line tool?

Username

Password

Only Username

Both a) and b)

What is DDL?

Data Definition Language

Data Degenerated Language

Data Delivered Language

Defined Definition Language

The ............. statement is used to delete a table.

DROP TABLE

DELETE TABLE

DEL TABLE

REMOVE TABLE

Use the .............. to delete the data inside the table, and not the table itself?

DROP TABLE

DELETE TABLE

TRUNCATE TABLE

REMOVE TABLE

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" is "Peter"?

SELECT * FROM Persons WHERE FirstName='Peter'

SELECT [all] FROM Persons WHERE FirstName LIKE 'Peter'

SELECT [all] FROM Persons WHERE FirstName='Peter'

SELECT * FROM Persons WHERE FirstName'Peter'

One of the early proponents of relational database who laid down many of the principles we use to this day was:

Edgar Codd

Xigang Koi

Robert Langton

Mahatma Coate

William Crawford

Which of these field types would be best to hold a .jpg image?

blob

text

nchar binary

char binary

What is Column?

A column defines multiple piece of data stored in all rows of the table.

A column defines one piece of data stored in all rows of the table.

A column defines one piece of data stored in one rows of the table.

A column defines multiple piece of data stored in one row of the table.

Which SQL statement is used to insert a new data in a database?

INSERT INTO

UPDATE

ADD

INSERT NEW

With SQL, how can you return the number of records in the "Persons" table?

SELECT COLUMNS() FROM Persons

SELECT COUNT(*) FROM Persons

SELECT COLUMNS(*) FROM Persons

SELECT COUNT() FROM Persons

Which SQL statement is used to return only different values?

SELECT DISTINCT

SELECT UNIQUE

SELECT DIFFERENT

SELECT DIFF

Which of the following is the correct SQL statement to use to remove rows from a table?

DROP

REMOVE ROW

DELETE

DELETE ROW

A SELECT command without a WHERE clause returns?

All the records from a table that match the previous WHERE clause

All the records from a table, or information about all the records

SELECT is invalid without a WHERE clause

Nothing

Which SQL statement is used to extract data from a database?

GET

Open

Extract

Select

Query

To use MySQL on your computer, you'll need?

FTP and Telnet

Some sort of client program to access the databases

A Browser

Perl, PHP or Java

Transactions are used to treat sets of SQL statements atomically.

True

False

What will happen at the end of the following sequence of SQL commands? BEGIN TRANSACTION DELETE FROM MYTABLE WHERE ID=1 DELETE FROM OTHERTABLE ROLLBACK TRANSACTION

The contents of OTHERTABLE will be deleted

The contents of both OTHERTABLE and MYTABLE will be deleted

The contents of OTHERTABLE will be deleted, as will be all the contents of MYTAB whoID is 1

The database will remain unchanged to all users except the one that executes these queries.

The database will remain unchanged

Which of the following is not an SQL aggregate function?

AVG

SUM

MIN

MAX

CURRENT_DATE()

Commands passed to the MySQL daemon are written in.

Your choice from Perl, PHP, Java or some other languages

the Structured Query Language

English

Swedish

Can I call a trigger directly called from an application?

Yes

With SQL, how do you select all the columns from a table named "Persons"?

SELECT * FROM Persons

SELECT Persons

SELECT [all] FROM Persons

SELECT *.Persons

How much storage space does DATETIME require?

4 bytes

2 bytes

8 bytes

1 byte

Internally information is held in tables. Which of these is NOT a valid format:

BDB

Isam99

MyIsam

Hash

InnoDb

In a SELECT with a GROUP BY clause, a WHERE clause, and a HAVING clause, the WHERE conditions are applied before the HAVING conditions.

True

Fasle

Either True or False

None of the above

Can joins be nested?

True

False

MySQL comes with as standard with client libraries for:

C only

Java only

Java and C

Perl, PHP and C

If you want to undo a GRANT, you should use

REVOKE

UNDO

UNGRANT

DELETE

ROLLBACK

What is an open source DBMS product that runs on UNIX, Linux and Windows

MySQL

JSP/SQL

JDBC/SQL

Sun ACCESS

With SQL, how can you delete the records where the "FirstName" is "Peter" in the Persons Table?

DELETE FROM Persons WHERE FirstName = 'Peter'

DELETE ROW FirstName='Peter' FROM Persons

DELETE FirstName='Peter' FROM Persons

Which of the following is used to delete an entire MYSQL database?

mysql_drop_database

mysql_drop_entiredb

mysql_drop_db

mysql_drop_dbase

What SQL clause is used to restrict the rows returned by a query?

AND

WHERE

HAVING

FROM

If an ENUM column is declared NOT NULL, its default value is the first element of the list of allowed values.

True

False, ENUM column cannot be null

False, its default value is the last element of the list of allowed values

Both b and c

Which of these field types would be best to hold a film title?

longblob

tinytext

mediumtext

longtext

How can we get the number of records or rows in a table?

Using COUNT

Using NUM

Using NUMBER

Both a and c above

Sometimes the expression "select count(*)" will return fewer rows than the expression "select count(value)".

True

False

Which of the following commands should be used to create a database named “student”?

CREATE ?I student

CREATE DATABASE student

DATABASE /student

DATABSE student

With SQL, how do you select all the records from a table named "Persons" where the "FirstName" is "Aru" and the "LastName" is "Sum"?

SELECT * FROM Persons WHERE FirstName'Aru' AND LastName'Sum'

SELECT * FROM Persons WHERE FirstName='Aru' AND LastName='Sum'

SELECT FirstName='Aru', LastName='Sum' FROM Persons

None of the above

USE keyword is used to select a ___________

Table

Column

Database

All of above

Primary Key does allow the Null Values. where as in Unique key doesn't accept the Null values.

False

True

What MySQL property is used to create a surrogate key in MySQL?

UNIQUE

SEQUENCE

AUTO_INCREMENT

None of the above

Which command is used for taking “server side help” in Mysql command line tool

None of these

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Database - Sql Test

Test Instructions :

1. The Test is 1hr duration.

2. The Test Paper consists of 30 questions. The maximum marks are 30.

3. All the questions are multiple choice question type with three options for each question.

4. Out of the three options given for each question, only one option is the correct answer.

5. Each question is allotted 1 mark for each correct response.

6. 0.25 will be deducted for incorrect response of each question.

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