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SQL

SQL database server stores data in table form. Tables are database objects used to collect data in Row and Column format. Rows represent the entities whereas columns define the attributes of each entity in a table.<br><br>

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SQL

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  1. SQL SQL (Structured Query Language) is a programming language which is used to manage data stored in relational databases like MySQL, MS Access, SQL Server, Oracle, Sybase, Informix, Postgres etc. Our SQL tutorial helps you learn SQL (Structured Query Language) in simple and easy steps so that you can start your database programming quickly. It covers most of the important concepts related to SQL for a basic to advanced understanding of SQL and to get a feel of how SQL works. SQL is a database computer language designed for the retrieval and management of data in a relational databases like MySQL, MS Access, SQL Server, Oracle, Sybase, Informix, Postgres etc. SQL stands for Structured Query Language. SQL was developed in the 1970s by IBM Computer Scientists.

  2. Why SQL? • SQL is widely popular because it offers the following advantages − • Allows users to access data in the relational database management systems. • Allows users to describe the data. • Allows users to define the data in a database and manipulate that data. • Allows to embed within other languages using SQL modules, libraries & pre-compilers. • Allows users to create and drop databases and tables. • Allows users to create view, stored procedure, functions in a database. • Allows users to set permissions on tables, procedures and views.

  3. How SQL Works? • When you are executing an SQL command for any RDBMS, the system determines the best way to carry out your request and SQL engine figures out how to interpret the task. • There are various components included in this process. These components are − • Query Dispatcher • Optimization Engines • Classic Query Engine • SQL Query Engine, etc. • A classic query engine handles all the non-SQL queries, but a SQL query engine won't handle logical files.

  4. What is RDBMS? • RDBMS stands for Relational Database Management System. RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access. • A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd in 1970.

  5. SQL Databases SQL or Relational databases are used to store and manage the data objects that are related to one another, i.e. the process of handling data in a relational database is done based on a relational model. This relational model is an approach to manage data in a structured way (using tables). A system used to manage these relational databases is known as Relational Database Management System (RDBMS). SQL Database Table Structure SQL database server stores data in table form. Tables are database objects used to collect data in Row and Column format. Rows represent the entities whereas columns define the attributes of each entity in a table. Columns: Columns are vertical elements in a table. Each column in a table holds specific attribute information, and column properties such as column name and data types (Integer, Char, String, etc). Rows: Rows are horizontal elements in a table and users can add data or retrieve by executing SQL queries.

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