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Technical interview preparation for coding job.

 

Entry-level technical interview question for software engineer.(PART-3)



1.         What is the Primary key and Foreign key?

The primary key-A key which is used to check whether the data in the specific column is unique or not.

Foreign key-A column or group of columns that gives a link between data in two tables.

 

2.         What are DDL (Data Definition Language) and DML (Data Manipulation Language)?

DDL (Data Definition Language)- A computer language that is used to either modify or to create the structure of database objects like view, schemas, tables or indexes etc.

DML (Data Manipulation Language)- A computer language that is used to manipulate data in the structure of database objects like inserting, retrieving/deleting or modifying from existing data etc.

 

3.         What is SDLC? Its stages?

Software Development Life Cycle

The Software Development Life Cycle (SDLC) is a process that allows the preparation of high-quality and low-cost production software.

Stages involved in SLDC are

1.    Planning

2.    Defining/Analysis

3.    Designing

4.    Coding/Implementation

5.    Testing

6.    Deploy/Maintenance


4.         What is Delete, Truncate, Drop and Create?

(Tuples-rows, Attributes-Column, Schema-Structure of table)

Delete- It is a DML command used to delete the tuples (it deletes one-by-one, have the facility to delete a single row)

Drop- It is a DDL command used to delete the entire schema.

Truncate- It is a DDL command is used to delete the tuples (it do the entire deletion task in one go, it is faster)

 

5.         What is the logic behind Palindrome, Armstrong, Perfect, Prime, Fibonacci numbers?

Prime no. are no. that are only divisible by 1 or itself

Palindrome no. i.e. 1334331 =same on reversing order of digits

Armstrong no. i.e. 153 =1^3 + 5^3 + 3^3, where 3 is total numbers of digits here.

Perfect no. i.e. 28 = 1+2+4+7+14(sum of all factor excluding no. itself)

Fibonacci series is an addition of numbers i.e. 1,1,2,3,5…

 

6.         Do you know any latest technology? Like ML/AI, Cloud, IoT, Cyber security etc?

1. Artificial Intelligence (AI) and Machine Learning

2. Robotic Process Automation (RPA)

3. Edge Computing

4. Quantum Computing

5. Virtual Reality and Augmented Reality

6. Block chain

7. Internet of Things (IoT)

8. 5G

9. Cyber Security

 

7.         What are aggregate and scalar functions?

Aggregate Function is an in-built function of SQL that returns a single value by undergoing operations from collections.(i.e.- SUM(), COUNT(), MIN(), LAST(), etc.)

Scalar Function is an in-built function of SQL that returns a single value from a single input.(i.e.- LCASE(),LEN(),FORMAT(), etc.)


8.         Do you know any latest technology? Like ML/AI, Cloud, IoT, Cyber security etc?

1. Artificial Intelligence (AI) and Machine Learning

2. Robotic Process Automation (RPA)

3. Edge Computing

4. Quantum Computing

5. Virtual Reality and Augmented Reality

6. Block chain

7. Internet of Things (IoT)

8. 5G

9. Cyber Security

 

9.         What are aggregate and scalar functions?

Aggregate Function is an in-built function of SQL that returns a single value by undergoing operations from collections.(i.e.- SUM(), COUNT(), MIN(), LAST(), etc.)

Scalar Function is an in-built function of SQL that returns a single value from a single input.(i.e.- LCASE(),LEN(),FORMAT(), etc.

10.         What are global and local variables?

A variable is like a box that stores values in a given memory location

Global Variables- The variable whose scope is declared even outside the function or block.

Local Variables- The variable whose scope is declared only inside the function or block.


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