Applications of data structure.
A data structure is a way of organizing data in some fashion so that later on, it can be accessed, queried, or even updated easily and quickly. It is a collection of values. The values can have relationships among them and they can have functions applied to them.
The data structures store the data according to the mathematical or logical model it is based on. The type of operations on a certain data structure makes it useful for specific tasks.
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What is SQL?
Structured Query Language or SQL, is a programming nomenclature used to do set operations (like union, intersect, and minus) to organize and retrieve information in relational databases, based on “set theory and relational algebra.” In any system that uses SQL, “data elements or attributes, categorized into columns, ..
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What is primary key?
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.
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What is RDBMS?
A database management system (DBMS) that incorporates the relational-data model, normally including a Structured Query Language (SQL) application programming interface. It is a DBMS in which the database is organized and accessed according to the relationships between data items. In a relational database, relationships between data items are expressed by means of tables. 
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What is a relationship and what are they?
A relationship, in the context of databases, is a situation that exists between two relational database tables when one table has a foreign key that references the primary key of the other table. Relationships allow relational databases to split and store data in different tables, while linking disparate data items.
There are three types of relationships between the data you are likely to encounter at this stage in the design: one-to-one, one-to-many, and many-to-many.
Stored Procedure

A stored procedure in SQL is a type of pre-written code that can be stored for later execution and then used many times hence, saving time. It is a group of SQL statements that performs the task. 
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What is normalization of databases, joins and keys?
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Difference between c, c++ and java?
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Comment down your answer ?
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Exception handling?
The Exception Handling in Java is one of the powerful mechanism to handle the runtime errors so that normal flow of the application can be maintained.
Java exception handling is managed via five keywords: try, catch, throw, throws, and finally. 
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7 layers of OSI reference model.
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Difference between java and javascript.
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Features of javascript
Javascript Features

Light Weight Scripting language.

Dynamic Typing.

Object-oriented programming support.

Functional Style.

Platform Independent.

Prototype-based.

Interpreted Language.

Async Processing.

Client-Side Validation

More control in the browser
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Advantages of javascript?
JavaScript is a dynamic computer programming language. It is lightweight and most commonly used as a part of the web pages, whose implementation allows a client-side script to interact with a user and to make dynamic pages. It is an interpreted programming language with object-oriented capabilities.
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What is a trigger with an example
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Python range() function and xrange() function.
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Node.js..
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Difference between main and secondary memory .
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In simple words, we defined it.
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