Data Manipulation Language

Data Manipulation Language

This is the second sub language in SQL which contain four commands those are INSERT, UPDATE, SELECT, DELETE and which is used for manipulate the data within database.

INSERT

This command is used to insert the records in the table using this command we can insert the data into the table in two methods

  1. Explicit method
  2. Implicit method
Explicit Method

In this method user need to enter all the values into the columns without left any column data.

Syntax

INSERT INTO <TABLE NAME> VALUES (Val1, Val2,------,Valn);

E.g

INSERT INTO EMP Values(101,’RAJU’,500);

Note

We can use & in front of any column. By placing like this the use is – β€œIt takes particular column values as default for remaining all values.

Syntax to insert the records into the table using insertion operation

INSERT INTO<Table name> VALUES(&col1,&col2,--------,&coln)

E.g

INSERT INTO EMP Values(&Eid,’&Ename’,&Sal’)
Implicit method

This method we can enter the values at required columns in the table.

E.g

INSERT INTO < Table name> (Col1,Col2,------,Coln) values(Val1, Val2,--------,Valn)

E.g

INSERT INTO EMP(EID,SAL) VALUES(115,9800) 

Syntax to insert record using & Symbol

INSERT INTO < TABLE NAME>(col1,col2,-------,coln) values(&col1,&col2------,&coln)

E.g

INSERT INTO EMP(Eid,Sal) VALUES(&Eid,&Sal) VALUES(&Eid,&Sal)
UPDATE

This command is used to modify the data existing table. Using this command we can modify all the records in the table also we can modify specific records in the table using WHERE clause.

Syntax

UPDATE <Table name> SET COLUMN NAME = β€œVALUE”;

Syntax

UPDATE EMP SET ENAME = β€˜RAJU’;

Syntax to modify more than one column data at a time

UPDATE <Table name> SET COL1=VALUE,COL2=VALUE,-------,COLN=VALUE

E.g

UPDATE EMP SET EID = 007, ENAME = β€˜JAMES’
DELETE

This command is used to delete the records from the existing table. Using this command we can delete all the records and also we can delete specific records from the table.

Syntax

DELETE FROM <Table Name> <Column Name>

E.g

delete from rose no;

delete from rose where name='Ashok';

delete rose name where name='Ashok' or name='Vinod';
Data Manipulation Language


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