EBK DATABASE CONCEPTS
EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133544886
Author: AUER
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 6, Problem 6.30RQ
Program Plan Intro

Cursor:

The term cursor is used to retrieve information in row by row fashion. If the records stored in the database table, which needs to be updated one row at a time is carried over by cursor.

  • It plays the major role in fetching a required row from the table in the database which holds numerous records.
  • Cursors are defined using SELECT statement.
  • It points the set of rows which is resulted from an SQL SELECT statement.
  • In general the cursor is placed in the first or last row.
  • It influences the performance of the SQL Server as it uses the SQL server instances memory, decrease network bandwidth, reduction in concurrency.
  • It’s recommended to avoid the use of cursor and the cursor can be replaced with WHILE loop, temporary tables, sub queries.

Types of cursor:

The types of cursor are listed below:

  • Forward-only cursor
  • Static cursor
  • Dynamic cursor
  • Keyset cursor

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