Chapter 04 How to retrieve data in a single table MIT 22033, Database Management System By: S. Sabraz Nawaz.

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Presentation transcript:

Chapter 04 How to retrieve data in a single table MIT 22033, Database Management System By: S. Sabraz Nawaz

What is SQL? SQL (pronounced "ess-que-el") stands for Structured Query Language. SQL is used to communicate with a database. According to ANSI, it is the standard language for relational database management systems. SQL statements are used to perform tasks such as update data on a database, or retrieve data from a database. Some common relational database management systems that use SQL are: Oracle, Sybase, Microsoft SQL Server, Access, etc. Although most database systems use SQL, most of them also have their own additional proprietary extensions that are usually only used on their system. The standard SQL commands such as "Select", "Insert", "Update", "Delete", "Create", and "Drop" can be used to accomplish almost everything that one needs to do with a database. Main and Functional categories are DML and DDL. MIT By. S. Sabraz Nawaz Slide 2

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Retrieve all data from a table SELECT * FROM TABLENAME MIT By. S. Sabraz Nawaz Slide 5

Retrieve more columns from a table SELECT COLUMN1, COLUMN2, COLUMNn FROM TABLENAME MIT By. S. Sabraz Nawaz Slide 6

Retrieve columns in descending order from a table SELECT COLUMN1, COLUMN2, COLUMN3 FROM TABLENAME ORDER BY COLUMN NAME ASC|DESC MIT By. S. Sabraz Nawaz Slide 7

Retrieve with calculated columns SELECT CALCULATION AS ALIAS FROM TABLENAME MIT By. S. Sabraz Nawaz Slide 8

Retrieve with filtered columns SELECT COLUMN1, COLUMNx… FROM TABLENAME WHERE CONDITION ORDER BY COLUMN NAME ASC|DESC MIT By. S. Sabraz Nawaz Slide 9

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