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Raising The Bar offers excellent SQL training courses. Structured Query Language (SQL) is a language used for viewing or changing data stored in the databases. The sentences utilised in this programming language are called SQL Queries. The various SQL commands like data definition language, data manipulation language and data control language have been discussed briefly.
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Introduction to SQL Introduction to SQL SQL Stands for Structured Query Language SQL is an ANSI (American National Standards Institute) standard, there are different versions of the SQL language. SQL lets you access and manipulate databases.
Types of SQL Commands SQL Commands DDL (Data Definition Language) DML (Data Manipulation Language) DCL (Data Control Language)
Introduction to SQL Data Definition Language Data Definition Language (DDL) statements are used to define the database structure or schema. CREATE - To create objects in the database ALTER - Alters the structure of the database DROP - Delete objects from the database TRUNCATE - Remove all records from a table, including all spaces allocated for the records are removed
Introduction to SQL Data Manipulation Language Data Manipulation Language (DML) statements are used for managing data within schema objects. SELECT - Retrieve data from the a database INSERT - Insert data into a table UPDATE - Updates existing data within a table DELETE - Deletes all records from a table, the space for the records remain
Introduction to SQL Data Control Language Data Control Language (DCL) is used to control access to data stored in a database. GRANT - Gives user's access privileges to database REVOKE - Withdraw access privileges given with the GRANT command
Introduction to SQL Contact Us Raising The Bar Address: Level 2, 80 Mount St North Sydney NSW, 2060 Australia Contact No: 1300 937 782 Email: craig@rtb.com.au Website: www.rtb.com.au