In a management system database, different SQL (Structured Query Language) or commands are used to interact with the database. Manipulation Language data, a subset of SQL, is used to modify, retrieve and insert data into a database. In any process involving target = "_blank"> dynamic web design and development of the database DML statements based applications are widely used in programs that work with the database.

Data manipulation language is primarily It consists of the following commands:

• SELECT
• INSERT
• UPDATE
• DELETE

SELECT
The SELECT statement is the most commonly used and basic SQL statement. For example, the process of development the website with a database can not be complete with the proper use of the INSERT statements for data retrieval. The SELECT statement retrieves data from a or more tables which can be further filtered or provided through clauses such as WHERE, ORDER BY, GROUP BY, HAVING, etc. and combined using JOIN statements.

INSERT
The INSERT command is used to add data to an existing table. In a SQL statement, the INSERT statement is followed by the INTO. For example:

EMP_DETAIL INSERT INTO VALUES ( "John", "Smith", "EMP1123", "$ 20000")

The above statement insert details like the "name", "LAST", "EMPLOYEE_ID", "" salary, etc in the table "EMP_DETAIL.

UPDATE
The UPDATE statement is used to modify existing records in a table. The UPDATE statement can be used for a single record or amendment bulk. For example:

UPDATE SET EMP_DETAIL Salary = Salary * 1.5 where EMPLOYEE_ID = "EMP1123"

This statement will increase the employee's salary of John Smith in 1.5 times.

DELETE
The DELETE statement is used to remove all or specific records of the table. For example:

EMP_DETAIL DELETE WHERE EMPLOYEE_ID = "EMP1123"
This statement deletes all information related to John Smith of EMP_DETAIL table. The DELETE statement can also be used with the wildcard character "*". For example:

DELETE * FROM EMP_DETAIL

This statement will delete all records in the table EMP_DETAIL. This option is useful in the discharge of any table without affecting the table indexes, structure and attributes.

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Article Source: ArticlesBase.com – Learning Data Manipulation Language

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