How to Update and Delete Data Using Cursor in SQL

In this article I am going to explain how to update and delete data using cursor in SQL.
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Introduction

A cursor is a database object that points to a result set. We use cursor to fetch any specific row from result set. Most of time cursor is used by application programmer.

Implementation of cursor in SQL

  • We can implement cursor through standard database APIs.
  • We can implement cursor through Transact-SQL

SQL Statement used in cursor

  • DECLARE : It is used to define a new cursor.
  • OPEN : It is used to open a cursor
  • FETCH : It is used to retrieve a row from a cursor.
  • CLOSE : It is used to close a cursor.
  • DEALLOCATE : It is used to delete a cursor and releases all resources used by cursor.

Update Data Using Cursor

We can update data using cursor in SQL.

update mcnvendors
set vendorname = 'manish'

where current of cur_invinfo


Delete Data Using Cursor

We can also delete data using cursor.

delete mcnvendors

where current of invinfo_cur1


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