MySQL and SQL Server are two leading database management systems. The key differences are that MySQL is open source and free while SQL Server requires payment for use. SQL Server offers more advanced features like indexed views, column-level security, triggers, stored procedures, and full join facilities that MySQL either lacks or had limited support for in earlier versions. SQL Server also provides more robust transaction management, replication, backup/recovery, and high availability capabilities compared to MySQL.

1. What is the difference between MySQL
and SQL Server?
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MySQL and SQL Server are the two leading databases that support front end applications related to various
domains. The differences between MySQL and SQL Server are listed below:
MySQL SQL Server
MySQL is available for free since MySQL is
an open source.
SQL Server is not an open source and
payment has to be made to use SQL Server.
MySQL offers only updateable views. SQL Server offers indexed views which are
much more powerful, performance wise.
MySQL does not support XML. SQL Server supports XML.
MySQL provides only table level security. SQL Server provides column level security.
MySQL does not offer any certification for
security.
SQL Server has C2 compliant certification.
Database security is verified by third party.
Earlier versionsof MySQL does not support
triggers. Only MySQL 5.0 supports triggers.
SQL Server provides triggers.
User defined functions are not supported in
MySQL.
User defined functions are supported in SQL
Server.
Cursor feature is not available in MySQL. Cursor feature is available in SQL Server.
Stored procedures and full join facility is not
offered in MySQL.
Stored procedures and full join facility are
offered in SQL Server.
Import and Export functions have very
limited support in MySQL.
Import and export are extensively supported
in MySQL.
Transaction support is very much limited in
MySQL.
Transaction support is extensively and fully
offered in SQL Server.
Replication support is very much limited in
MySQL.
Replication support is extensively and fully
offered in SQL Server.
Auto tuning is not supported in MySQL. Auto tuning is supported in SQL Server.
Job scheduling and profiling are not available
in MySQL.
Job scheduling and profiling are available in
MySQL.
Online backup support and clustering support
is limited in MySQL.
Online backup support and clustering support
is extensive and complete in SQL Server.
Log Shipping and Storage Area Network Log Shipping and Storage Area Network

2. support is not available in MySQL. support is available in SQL Server.
OLAP Services, Data Reporting and Data
Mining are not supported in MySQL.
OLAP Services, Data Reporting and Data
Mining are supported in SQL Server.
What is the difference between AJAX and
JavaScript?
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AJAX and JavaScript are related due to fact that Ajax is the methodology that is used by the JavaScript to get
the data from the server. Although Ajax and JavaScript are interrelated there are few differences between
AJAX and JavaScript:
AJAX JavaScript
AJAX allows the coder send request data
asynchronously in order load new data
without changing the web page.
JavaScript is a client side scripting language that
allows the creation of dynamic web pages by
providing a new level of interactivity.
AJAX supports the server side scripting
Language.
JavaScript provides support to the client side
scripting language.
AJAX can load the web page after it is been
loaded for the first time.
JavaScript cannot load the pages after it is once
loaded.
AJAX does not install Trojan in the
computer.
JavaScript can install Trojan in the computer.

3. What is the difference between AJAX and
JQuery?
AJAX and JQuery are two different technologies that are very useful in creating the web application in an
interactive way and in making the application look and work more effectively. The difference between AJAX
and JQuery are:
AJAX JQuery
AJAX is a powerful tool which cannot use
HTML since it is a simple tool and it can not
reload the page after it is once loaded.
JQuery is a light weight language that focuses the
interaction in the HTML elements.
AJAX is a combination of several
technologies such as CSS, HTML, DOM
and many more. In combination with these
technologies, AJAX provides new
functionalities.
JQuery cannot provide a new functionality by
combining with other technologies.
AJAX should be accessed in a proper
procedure to retrieve data from the server.
JQuery can be accessed through front-end therefore
JQuery does not require understanding of the
complete procedure to setup a page.
Heavy usage of AJAX often leads to the
server overload due to more number of
connections created.
There is no chance for overload of server while
using JQuery since there is no such heavy usage in
JQuery.
What are the advantages of AJAX?
The advantages of AJAX are:
XMLHttpRequest: The XMLHttpRequest of Ajax provides support to different kinds of HTTP request
types. AJAX XMLHttpRequest can be used to send request for non-AJAX pages as well.
IFrame: The IFrame feature in AJAX supports every modern browser and asynchronous file uploads.
AJAX can make request by both POST and GET methods.
Cookies: Even though there is an implementation difference between the browsers, the cookies in
AJAX provides support for more number of browsers.
Interface: The interface in AJAX is very responsive. The required section of the page is transferred at
a point of time rather than transferring the whole page.
Waiting Time: The waiting time in AJAX has been reduced.
Traffic: In AJAX, the traffic which occurs during the ‘To’ and ‘From’ process in the server has been
reduced.

4. What is the purpose of AJAX?
AJAX is a set of web development methods that are inter-related and used for creation of asynchronous web
application. AJAX can retrieve and send data to the server without disturbing the display and activities
performed in the existing page. AJAX uses set of technologies in an efficient way. AJAX uses CSS and HTML
together to mark up and include style details. The DOM is contacted using JavaScript to achieve dynamic
interaction between the user and the application. JavaScript and the XMLHttpRequest objects together provide
a technique for exchange of data between server and the browser in an asynchronous manner there by
avoiding full page reloads.
How to find a string type in PHP?
PHP provides a function is_string() to test the type of the variable if it is a string or not. The following php code
demonstrates the details.
function test_string($str)
{
if (!(is_string($str))) {
echo "$str is not a string type";
} else {
echo "$str is a string type";
}
}
echo test_string("1");
echo test_string("abc");
echo test_string(1);

5. The above code will display the following outputs:
1 is a string type
abc is a string type
1 is not a string type