Sunday, 10 February 2013

Introduction to SQL

Introduction to SQL
SQL is a standard language for accessing and manipulating databases.

What is SQL?

SQL stands for Structured Query Language
SQL lets you access and manipulate databases
SQL is an ANSI (American National Standards Institute) standard.

Capabilities of  SQL 

SQL can execute queries against a database.
SQL can retrieve data from a database.
SQL can insert records in a database.
SQL can update records in a database.
SQL can delete records from a database.
SQL can create new databases.
SQL can create new tables in a database.
SQL can create stored procedures in a database.
SQL can create views in a database.
SQL can set permissions on tables, procedures, and views.
SQL is a Standard - BUT....

RDBMS stands for Relational Database Management System.
RDBMS is the basis for SQL, and for all modern database systems such as MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.

The data in RDBMS is stored in database objects called tables.

A table is a collection of related data entries and it consists of columns and rows.

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