The relational database model was introduced so that the data is stored in a readable format and can be accessed quickly when needed. In order to overcome this drawback of databases, relational databases were introduced. This whole process was very time consuming and ineffective as the data required should be extracted quickly. They had to first familiarize themselves with the structure and access the data. When a user or a developer had to find certain data from a database they had to first find out about the structure of that database. Every application has its own way of storing data in its own self-defined data structure. Relational Database Modelĭuring the time when the concept of the database was new, everyone had their own structure or format in which they stored data. The benefit of this rule is that it helps save up storage spaces and also saves the database from the risk of storing huge amounts of duplicate data. For example one of the integrity rules is that the tables do not allow the storage of duplicate values.
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making changes or managing physical database structure does not affect the access to data in the logical database structure.Īnother plus point of relational databases is that they have a certain set of defined integrity rules which ensure that the data is not corrupted or contains deformities. One of the biggest advantages of having relational databases is that they consist of two types of database structure and making changes or managing one database structure does not affect the data stored in the other database structure i.e. these files contain information about the changes made to the stored data file that tracks the physical components of the database The physical database structure consists of the following elements: The logical databases structure consists of the following elements: The logical database structure is related to how an application or a user can specify what data it needs whereas physical database structure is related to how the data specified by the user or application can be accessed and how will this task be carried out using what resources. One is logical database structure and the other one is physical database structure.
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There are two types of database structures. Although it is a quite small table as shown the columns consist of attributes of data and the rows consist of data stored corresponding to these attributes.įigure 1 Example of a table in Relational Database How do relational databases work? Following is an example of a relational database. The rows consist of records that exist corresponding to a unique identification number which is called a key. The columns in this table consist of the attributes or characteristics of data on which the data is categorized. A relational database is based on a relational model which is a pretty simple model in which the data is stored in the form of tables consisting of rows and columns. This makes it easier to depict the data and data handling is made easier when it is arranged in tables. Relational DatabaseĪ relational database can be considered as a table in which the categories of data are stored in columns and the data is stored in rows. So before understanding the working of SQL we will first have to understand how relational databases work. SQL is mainly used on relational databases.
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In order to understand how SQL works first, we have to understand the median on which it is used. SQL is used to access the data in these tables, query it, modify it, delete it, or use it for our own analysis.
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In rows, the data is stored and the rows are called table records. In columns, there are different characteristics on which the data is categorized. In these tables, there is a set of rows and columns. A relational database is a type of database in which the data is stored in the form of tables. Most commonly SQL is used to work with relational databases. SQL is an acronym for Structured Query Language and it is a programming language that is used to work with databases. On what principles does it work and what is its history? SQL In this article, we will discuss what is SQL? And what part is it playing in shaping business in today’s world? In order to understand this first, we need to understand what is the need for SQL and how it works.