sql server update cursor example

Original: http://ntk2006.blog.sohu.com/135331235.html Cursor ConceptCursors provide a flexible way to retrieve and operate data from tables. cursors are mainly used on servers to process SQL statements sent from clients to servers, or data

I. cursor Recognition Cursor allows you to access the result set returned by SQL Server row by row.A major reason for using cursor is to convert the set operation into a single record processing method.After retrieving data from a database using

CursorA cursor is a data buffer opened by the system for the user, which holds the results of the SQL statement execution. Each cursor area has a name that allows the user to retrieve the record from the cursor one at a-and assign it to the main

Cursor and dynamic SQL, cursor dynamic SQL Cursor type: Static cursor (the cursor is statically bound to a select statement during compilation. This cursor can only act on one query statement) and dynamic cursors (that is, we want our query

1. Define the cursor DefinitionThe core of a cursor statement is to define a cursor Identification name and associate it with a query statement. The DECLARE statement is used to DECLARE the cursor. It defines the data set stored in the cursor

A MS-SQL cursor is a temporary database object that is used to rotate copies of data rows stored in a system Permanent Table, it can also point to the data row stored in the system Permanent Table. A cursor provides you with a method to operate data

What is a cursorThe result set, which is the collection of all row data returned after the select query.Cursors are a mechanism for working with result sets, which can locate a row in the result set, read or write multiple data, or move the cursor

During database development, when you retrieve data that is only a single record, the transaction statement code that you write tends to use the Select INSERT statement. But we often encounter situations where one record is read from one result set

During database development, when the data you retrieve is only one record, the transaction statements you writeCodeSelect Insert statements are usually used. However, we often encounter this situation, that is, reading a record from a result set

One: Understanding CursorsCursor It enables the user to access the result set returned by SQL Server on a row-by-line basis.One of the main reasons for using cursors is to convert the set operation to a single record processing mode.When data is