Top SQL Interview Questions to Prepare for 2020

Are you preparing for SQL as your career choice and don’t know where to start? Well, then you are in the right place! In this blog, we have prepared a list of SQL Interview Questions that are most likely to be asked by the interviewers. The list of questions contains all the basic to advance level questions to help the students prepare thoroughly for the technical interview.

1. What is SQL?

SQL stands for Structured Query Language which is a relational database management system used to organize the data stored.

2. Can you differentiate between SQL and MySQL?

 SQL refers to the standard language which is used to retrieve and manipulate data whereas, MySQL is a relational database management system used to manage the SQL database.

3. What are constraints in SQL?

Constraints in SQL specify the rules for the data stored in the database. Some of the constraints are:

• CHECK
• DEFAULT
• NOT NULL
• INDEX
• UNIQUE
• PRIMARY KEY
• UNIQUE KEY

4. Define tables and fields in SQL.

In SQL, the data are stored in the form of horizontal rows and vertical columns. This type of organization for the stored data is known as tables. While the rows are known as records, the columns are known as fields that specify the categories of the data stored.

5. What are Join in SQL and its different types?

Join in SQL is a keyword that is used to combine any two records or rows of more than one table. The joining is done on the basis of the similarity of columns between the tables. In SQL, there are 4 types of Joints:

• (INNER) JOIN
• LEFT (OUTER) JOIN
• RIGHT (OUTER) JOIN
• FULL (OUTER) JOIN

If you want to learn more, you can also see Technical Interview Questions

Updated HTML Interview Questions 2020

Here is a compilation of updated top HTML interview questions 2020 that will help you to crack your interview and dig deeper into the emerging career of an HTML programmer. These questions are prepared for both of the fresher and experienced developers who are preparing for a job interview. As we all know that HTML is a very basic language that is required for starting the work on web development. So, I am sure these listed below questions will help you to get an insight into the HTML interview questions. 

• What do you understand by HTML?

HTML stands for Hypertext Markup Language and it is used for creating the templates of the websites to present the content over worldwide web.

• Name some of the common lists that are being used for designing a page?

Some of the common lists that are being used for designing a page are as follows:

• Ordered list
• Unordered list
• Definition list
• Menu list
• Directory list

• What is an image map?

Image map allows us to link between the various web pages with the use of just one single image. Also, the shapes image shapes can be a part of an image mapping.

• How can we insert a copyright symbol on a browser page?

We can insert a copyright symbol on a browser page by typing © or & #169; in an HTML file.

• How can we create a Hyperlink in HTML?

HTML contains an anchor tag that is responsible for creating a hyperlink linking one page to another page. These following tags can be appear in the ways such as

• Active Link
• Visited Link
• Unvisited Link

So, that is all about the HTML Interview questions that are frequently asked by the recruiters. If you are a novice and not clear about the concepts of the HTML, you can learn HTML Online to dig deeper into HTML basics.     

Top 30 Perl Interview Questions 2020

Coding Tag offers you the PERL interview questions with detailed explanations of every section covering PERL language basics that are required before facing a PERL developer interview.

1) PERL stands for?

Practical Extraction and Report Language

2) Who Developed the PERL language?

Larry Wall

3) What is PERL?

Perl is the most prominent interpreted open source programming language containing a wide range of libraries, programmer, and resources used for various tasks related to web development, system administration, network programming, GUI development, report language, practical extraction and other bulk text processing tasks.

PERL is trendier nowadays due to its rapid development cycle and text manipulation capabilities.

4) List some features of PERL?

PERL contain effective inbuilt regular expressions for Data Transformation and Filtration

Support web data encryption including e-commerce transactions

Support DBI package for easy web-database integration

Support Unicode, procedural and object oriented language

SWIG and XS can be used for Perl interfaces with external C++/C libraries

Perl is the request-response type of language

Single script can be used in multiple devices

Platform independent

It is simple to learn Perl language

5) What is the main reason for choosing PERL language as a scripting language?

Following are the reasons for selecting PERL languages as a scripting language:

Perl single line of code is equivalent to multiple line codes in another language.

Single script can be used in multiple devices

You don't need to implement our own logic as in Python or C

It contains huge built-in parsing interpreter, pattern matching, and regular expressions.

6) Differentiate Between USE and REQUIRE?

USE	REQUIRE
Act at compile time (Perl compilation phase)	Act at runtime
File extension is not required	File extension is not required
Used for only modules	Used for modules and libraries

7) How can you empty an array?

There are three methods to empty an array that is as follows:

By setting length placing its length to any negative number.

By assigning a null list().

Set an array to undef to clear it.

8) Is the length of Perl code is same as in C++ and Java code?

Perl code is less as a comparison to Java and C++ language since Perl code is one-fifth the size of the C++ code, we need less to maintain, write and debug.

9) Is Binary extension can be load dynamically?

Yes, the Binary extension can be loaded dynamically if your systems support it.

10) Between the list and the terms, which has the highest precedence?

Terms have the highest precedence in comparison with list operators. Terms are variables, expressions in parenthesis, quotes etc.

Read more article :https://www.codingtag.com/top-30-perl-interview-questions

Top 50 PHP Interview Questions

Hey all,

Being from an IT background myself, I have always been keen to learn about PHP development. I know you do too, that is why you are probably reading my blog! 

So, collected from my personal experience of attending ample number of PHP interviews, I have devised a list of PHP Interview Questions including almost every question I have faced while my interview session. I will also help you with properly framed answers to each question to improve the way you are preparing for your interview. Let's begin!    

1. What does the initials of PHP Stands for?

PHP means PHP: Hypertext PreProcessor that previously stood for personal home pages.

2. Who is the father of PHP?

Rasmus Lerdorf

3. The basic question that can come under both simple to advanced php interview questions is "what do you mean by PHP"?

PHP is an open source server-side scripting language that allows creating web pages dynamically and is used for web applications and can be embedded into HTML code.

To access PHP Scripts, only a web browser is required by client computer. PHP can also be used in combination with various web content management systems, web template systems, and web frameworks.

4. Which programming language does PHP resemble?

PHP syntax bears resemblance with PERL and C.

5. What PHP version is extensively used currently ?

Version 7.1 / 7.2

6. What do you mean when you say PHP is Open-Source?

Open-Source Software refers to the software that is dispersed with source code, can be freely used, read, modified and shared by anyone.

PHP is an Open-Source Software (OSS) as it meets the following benchmarks:

1. a) Source code of PHP is included with the program and is distributed freely.
2. b) Modified versions of source code for PHP are also redistributed.
3. c) Users are able to modify the distributed PHP source code.

7. How can we submit a form without a submit button?

JavaScript submit() function can be used to submit form without submit button on click call document.formname.submit ().

8. How can we create a database using PHP and MySQL?

We require a database before saving or accessing any data and to create any database in MySQL, CREATE DATABASE Statement is used.

e.g. mysql_create_db("Database Name")

read more

9. How to include a file to a PHP page?

It is possible to include one PHP file's content to other PHP file. The two functions "include()" and "require()" with file path as its parameter can be used to include a file.

10. What is role of Ksort() in PHP?

Ksort() is an inbuilt PHP function which is used to sort an associative array key in ascending order of its key values. For example:

$age=array("Jai"=>"59", "Dolly"=>"43", "Mack"=>"49", "Sam"=>"46");

ksort($age);

foreach ($age as $a => $b)

{

echo "$a = $b\n";

}

?>

Output:

Dolly = 43   Jai = 59 Mack = 49   Sam = 46

11. How to get the value of current session id?

session_id() function can be used to return the session id.

12. What are the functions of header () function in PHP?

This function is used for sending raw HTTP header to the client, and redirection of pages. It is very important to remark, that header() must be called before real output is seen, either by blank lines in a file, or from PHP or HTML tags.

13. Are multiple inheritances supported in PHP?

PHP includes only single inheritance. A Class can be extended from only one class and keyword used is 'extended'.

14. How can we execute a PHP script using command line?

We just need to run the PHP command line interface program and add the PHP Script file as the Command line argument

echo "Test";

echo "\n";

?>

Following are the four steps and paths that can be used to execute PHP in command line.

1. First login to your windows system.
2. Press windows and R key of keyboard simultaneously to open command prompt.
3. To find PHP executable file, move across PHP directory.
4. Executable file is accessed and then Path to PHP File.

The path with Change directory command used is C:\wamp\bin\php\php5.3.13. For Wamp Web Server users: php.exe path-to-your-php-file. If you visualize PHP version info, you can use PHP path-to-your-php-file instead of that command.

15. How can PHP and HTML Interact?

It is possible to generate HTML through PHP scripts and it is possible to pass information from HTML to PHP.

Read Full article:https://www.codingtag.com/top-50-php-interview-questions

Top 50 HTML Interview Questions

HTML Interview Questions,

After study, the toughest stage is how to crack an interview. Going for a job interview make us feel like we are back in school examination. In an interview, our job is to show our hidden talent and convince a recruiter that we have a required talent.

For this, we have limited time to provide true representation of our skills, experience, and knowledge to recruiters. To impress a recruiter, we have discussed top html interview questions that are listed below:

1. What is HTML?

HTML is the short form of "Hypertext Markup Language". It is a computer language used to create web pages by using the ordinary text. It is not so difficult to learn and understand.

It consists of some syntax and code words same as like other computer languages. The HTML file must be saved with .html extension. read more

2. Describe the different versions of HTML?

HTML has come with so many different versions from beginning to till like HTML, HTML+, HTML 2.0, HTML 3.2, HTML 4.0 and the latest version of HTML 5.

3. What is a DOCTYPE?

DOCTYPE means Document Type Declarations. It is used to specify the web browsers that which types of documents (such as SGML or XML Documents) it will receive. In the HTML program, the <!DOCTYPE> comes above the <html> tag.

Important Note: I will prefer you to buy this book which helps to understand the major concepts of HTML, CSS, JS and JQuery 

4. One of the core concepts in html interview question for freshers is to explain HTML tags?

HTML tags consist with three main elements which are opening tag, content and a closing tag, but some tags need only open tag, not close tag. The opening and closing tags are written in the angle brackets like <>.

The opening tag is the indication to start the command and the closing tag is the indication to close the command, hence it comes with the slash. See the syntax below:

<tag> content </tag>

5. How many types of HTML tags?

Generally, HTML tags come in two types paired tag and unpaired tag. The paired tags are much, but unpaired tags are very less.

The examples of paired tags are <p> </p>, <h1> </h1>, <b> </b>, <i> </i>, etc.

The unpaired tags are <br>, <img>, etc.

6. Name the list tags which are used to design a web page?

List tags are very helpful to design a systematic web page. See below the list tags, which make your web page orderly.

• ordered list
• unordered list
• definition list
• menu list
• directory list

All these tags can be used to compose a web page

Read more article: HTML INTERVIEW QUESTIONS 

DevOps Interview Questions 2019-2020

1) What do you mean by DevOps?

DevOps is a software development methodology whose objective is to become a bridge GAP between development and operational team of the Company. Its emphasis on the collaboration and communication of developers and other IT professionals.

Basically, it resolves all conflicts between OPS and development team and main targets on fast software delivery with fewer failure rates.

2) List some of the key elements of DevOps?

1. a) Infrastructure as code
2. b) Automation
3. c) Monitoring
4. d) Security
5. e) Continuous deployment
6. f) Accelerating speed of delivering applications
7. g) Frequently learning improvement via feedback
8. h) Animated by Agile Process
9. i) Increase Deployment frequency
10. j) Lessen lead time between fixes
11. k) Eliminate disconnects
12. l) Real-time feedback loop concept

3) What do you mean by continuous Integration in DevOps?

Continuous integration acts as a secondary element of the Agile process. In this practice, developers continuously merge their code modification into a central repository and act as an integration phase of the software release process with an objective of monitoring bugs and quality improvement and reducing time delay of software release and validation.

4) What is the role of Amazon Web Services in DevOps?

AWS delivers services beneficial for DevOps practicing at the various organizations. This software automates entire manual tasks and team management in a complex environment and also assists engineers for maintaining high velocity and stability.

Some of the benefits provided by AWS are given below:

1) More programmable

2) Instant startup without installing.

3) Permits automation for efficiency.

4) Provide more security

5) No upfront fees and termination penalty

5) List out some popular tools for DevOps?

1. a) Ansible
2. b) Git
3. c) Jenkins
4. d) Donkers
5. e) Kubernetes
6. f) Nagios
7. g) Raygon

6) What are the benefits of continuous delivery on DevOps?

1) Raise the number of deliveries.

2) The risk of production failure decreases.

3) Diminish manual work.

4) Boost team confidence.

5) Enables the team member to automate entirely.

6) Permit rapid feedback.

7) What are the stages of DevOps?

1. a) Planning
2. b) Coding
3. c) Building
4. d) Testing
5. e) Deploying
6. f) Operating
7. g) Monitoring

8) What is the role of vagrant in DevOps?

Vagrant is the most impressive tool, used virtual box as the hypervisor for virtual environment and KVM management and in creating a testing environment.

It is an open source tool permits the user to create a configuration file, user-friendly command line interface in less time and also improve wholly workflow of using puppet.

9) Is DevOps is beneficial to developers?

Yes, it allows monitoring, detecting, fixing a bug, implementing advanced features more quickly and also facilitates clear interaction among team members.

10) What is version control?

A software system permits a team of the organization for source code modification over time. It continuously traces code modification and keeps a record of it on a database.

Moreover, it also examines errors and issues occur due to some modification.

1. a) Benefits of version control
2. b) Coordinating teams
3. c) Version tracking
4. d) Flexibility of work

Read Full Story From Here:- Devops Interview Questions

Top 30 SQL Interview Questions

SQL is probably used for database interaction and management. Nowadays, SQL skills are essential for getting jobs, especially in the web development field. In this blog, I am going to introduce a set of SQL interview questions to cope up with the growing competition in IT markets.

Let’s Continue !!

1) What is DBMS?

DBMS is known as the file manager program that is designed for data management in the database which includes creating, implementing and maintaining data. It provides a systematic method to perform modification, administration, and retrieval. Data present in the DBMS’s applications are stored as a file.

2) What is RDBMS?

A relational database management system (RDBMS) is a software program store information in the form of tables. Moreover, it offers the relational operators for performing data manipulations across the tables.

3) What do you mean by SQL?

SQL (Structured Query Language) is known as the standard language to interact with the database. It is designed to accomplish database tasks like retrieval and insertion.

4) What do you mean by “Table” in a Database?

A table is known as a database object that can be used for storing the record in terms of rows and columns.

5) What is “Record” in a Database?

A record is known as the row of the table that contains arranged sets of interrelated data. It has the capability to hold multiple values. Moreover, It is known as a data structure to hold different kinds of data items.

Example

< 402 yuvi 405>

6) What do you mean by the “database” in DBMS?

The database comprises of logically related records or data.

7) List some major objectives of DBS?

* Data availability

* Data integrity

* Data independence

8) List some applications of the DBS system?

* Reservations systems

* Telecommunications

* Banking

* Sales

* Scientific applications

9) What are the keys that are present in DBMS?

There are mainly six key founds in DBMS to manage the table. They are:

* Candidate key

* Foreign key

* Primary key

* Secondary keys/Alternate key

* Composite key

* Super key

10) How can you maintain and identify relations between two or more than two tables in DBMS?

Keys are used in maintaining the relationship between tables.

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