In SQL procedures, a cursor make it possible to define a result set (a set of data rows) and perform complex logic on a row by row basis. By using the same mechanics, an SQL procedure can also define a result set and return it directly to the caller of the SQL procedure or to a client application.
What is the benefit of using cursor?
Advantages of using Cursor:
Cursors can provide the first few rows before the whole result set is assembled. Without using cursors, the entire result set must be delivered before any rows are displayed by the application. So using cursor, better response time is achieved.
Is it good to use cursor in SQL?
Cursors could be used in some applications for serialized operations as shown in example above, but generally they should be avoided because they bring a negative impact on performance, especially when operating on a large sets of data.
Why we use cursor in stored procedure?
Cursor is a Database object which allows us to process each row and manipulate its data. A Cursor is always associated with a Select Query and it will process each row returned by the Select Query one by one.
Why do we need cursor in database?
Cursors are used by database programmers to process individual rows returned by database system queries. Cursors enable manipulation of whole result sets at once. In this scenario, a cursor enables the sequential processing of rows in a result set.
Which is better cursor or while loop?
Always confusing thing is which one is better; SQL While loop or cursor? While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.
What is cursor in SQL?
A cursor holds the rows (one or more) returned by a SQL statement. The set of rows the cursor holds is referred to as the active set. You can name a cursor so that it could be referred to in a program to fetch and process the rows returned by the SQL statement, one at a time.
How many rows can a cursor hold?
A cursor can hold more than one row, but can process only one row at a time.