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Cursors (SQL Server)

Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance

Operations in a relational database act on a complete set of rows.

For example, the set of rows returned by a statement consists of all the rows that satisfy the conditions in the clause of the statement. This complete set of rows returned by the statement is known as the result set.

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Applications, especially interactive online applications, can't always work effectively with the entire result set as a unit. These applications need a mechanism to work with one row or a small block of rows at a time. Cursors are an extension to result sets that provide that mechanism.

Cursors extend result processing by:

Allowing positioning at specific rows of the result set.
Retrieving one row or block of rows from the current position in the result set.
Supporting data modifications to the rows at the current position in the result set.
Supporting different levels of visibility to changes made by other users to the database data that is presented in the result set.
Providing Transact-SQL s