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Data Engine for Database Developer: Introduction to SQL

SQL Server, a data engine introduced by Microsoft, lies at the core of data Management solution of an organization. It allows secure, efficient storage and Management of data. SQL database Server also provides other components and Services that support the business intelligence platform to generate reports and facilitate Data analysis used by database developer.

Every organization needs to maintain information related to employees, Customers or Business partners. Organizations build business applications either to store and manipulate the information or to generate reports. In addition, they need a platform that can be used to store and maintain these information in an efficient way. Various database management systems (DBMS) and relational database Management system (RDBMS) such as SQL Server 2005, Oracle and Sybase can be used to maintain this information.
How to install SQL Server
It is important for a database developer to identify the role of a database server in an organization, to effectively design and implement database solutions by using SQL Server, to identify its components and services. In Addition, you need to understand the basics of SQL, a language that is used to query and manage data.

Role of a Database Server

Earlier, organizations used to store the data on paper. With an increase in the usage of computers, they began building and using business applications to support the business operations.

The business applications accept data/information as input, process the data based on business requirements and provide data/information as output. For example, an application that maintains the sales details for an organization, accepts the details of the sales transaction from the users. The data is saved and an output message will display confirming that the data has been saved.

For example, the Human Resource department of an organization uses an application to manage employee’s data. The users need to add the details of new employees. The application provides an interface to enter the employee details. These details are validated for accuracy based on business rules. A business rule is defined to check that the date of joining of the new employee is less than or equal to the current date. If the data meets the requirements, it is saved in the data store.

Architectures used in Business application

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Difference between Linear search and Binary Search in c language

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Binary Search Linear Search Works only on sorted items. such as  1,2,3,4,5,6  etc
Works on sorted as well as unsorted items. 12,4,5,3,2,1 etc Very efficient if the items are sorted Very efficient if the items are less and present in the beginning of the list. such as Suppose your list items are : 12,3,4,5,1 and you want to search 12 number then you get beginning in the list. Works well with arrays and not on linked lists. Works with arrays and linked lists.
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Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:


      Suppose next node is allocated at an address 506, so the list becomes,



  Suppose next node is allocated with an address with an address 10,s the list become,


The other way to represent the linked list is as shown below:




 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …