What is a Database?

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Answer:

Database is nothing but an organized form of data for easy access, storing, retrieval and managing of data. This is also known as structured form of data which can be accessed in many ways.

Example: School Management Database, Bank Management Database.

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820. What are tables and Fields?

Answer:

A table is a set of data that are organized in a model with Columns and Rows. Columns can be categorized as vertical, and Rows are horizontal. A table has specified number of column called fields but can have any number of rows which is called record.

Example:.

Table: Employee.

Field: Emp ID, Emp Name, Date of Birth.

Data: 201456, David, 11/15/1960.

Emp ID	Emp Name	Date of Birth
201456	David	11/15/1960

# Tutorial: SQL Basic Overview

Question: SQL Introduction Short

821. What is a unique key?

Answer:

A Unique key constraint uniquely identified each record in the database. This provides uniqueness for the column or set of columns.

A Primary key constraint has automatic unique constraint defined on it. But not, in the case of Unique Key.

There can be many unique constraint defined per table, but only one Primary key constraint defined per table.

# Tutorial: Unique

Question: SQL Constraints Short

822. What are the types of join and explain each?

# Tutorial: Joins Introduction

Question: SQL Joins Long

823. What is Denormalization?

Answer:

DeNormalization is a technique used to access the data from higher to lower normal forms of database. It is also process of introducing redundancy into a table by incorporating data from the related tables.

# Tutorial: SQL Basic Overview

Question: SQL Introduction Short

824. What are all the different normalizations?

# Tutorial: Create Database

Question: SQL Database Long

825. What is a View?

Answer: A view is a virtual table which consists of a subset of data contained in a table. Views are not virtually present, and it takes less space to store. View can have data of one or more tables combined, and it is depending on the relationship.

# Tutorial: Views Introduction

Question: SQL Views Short

826. What is an Index?

Answer: An index is performance tuning method of allowing faster retrieval of records from the table. An index creates an entry for each value and it will be faster to retrieve data.

# Tutorial: Index

Question: SQL Constraints Short

827. What are all the different types of indexes?

# Tutorial: Index

Question: SQL Constraints Long

828. What is a Cursor?

Answer: A database Cursor is a control which enables traversal over the rows or records in the table. This can be viewed as a pointer to one row in a set of rows. Cursor is very much useful for traversing such as retrieval, addition and removal of database records.

# Tutorial: SQL Basic Overview

Question: SQL Introduction Short

829. What is a relationship and what are they?

# Tutorial: About SQL Tutorial

Question: SQL Introduction Long

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