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SQL-CURSOR 

Pooja Goel  |   Nov 16, 2019  |  Views: 10

Description:

Cursor is a temporary area which contains all information needed to process SQL statement.


It is used to retrieve data for one row at a time. There can be one or more SQL statement.


Use of Cursor

There are steps to create cursor:



Syntax of Cursor:

 

DECLARE Cursor_Name
CURSOR FOR 
 Select Query
Open Cursor_Name
Fetch Next From Cursor_Name Into parameter
While (@@Fetch_status=0)
BEGIN
Fetch next from Cursor_Name into Parameter
END
Close Cursor_Name
Deallocate  Cursor_Name



Example:


There is a table "EmployeeDetail" and declared two variables @name and @salary, and Cursor is used to retrieve data for "Name" and "Salary"

 columns from EmployeeDetail table.


EmployeeDetail Table :




DECLARE 
    @name VARCHAR(MAX), 
    @salary   DECIMAL;
 
DECLARE cursor_Employee CURSOR FOR
 SELECT Name, Salary FROM EmployeeDetail
 
 OPEN cursor_Employee;
 
FETCH NEXT FROM cursor_Employee INTO 
    @name, 
    @salary;
 
WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT @name + CAST(@salary AS varchar);
        FETCH NEXT FROM cursor_Employee INTO 
            @name, 
            @salary;
    END;
 
CLOSE cursor_Employee;
 
DEALLOCATE cursor_Employee;


Output:





Comments:
Content Contributor
Pooja Goel

Pooja Goel

Sr. Software developer at Damco Solutions Pvt. Ltd.  |   Noida, Uttar Pradesh, India

I am a sr. software developer working on technologies like SQL, SSIS, SSRS, DB2,Tableau, ASP.NET having 7 years of experience.


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