How do you define cursor?

How do you define cursor?

A cursor is a pointer to this context area. PL/SQL controls the context area through a cursor. 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.

What is a Oracle cursor?

In Oracle, a cursor is a mechanism by which you can assign a name to a SELECT statement and manipulate the information within that SQL statement.

How do I create a cursor in Oracle SQL?

There are four steps in using an Explicit Cursor.

1. DECLARE the cursor in the Declaration section.
2. OPEN the cursor in the Execution Section.
3. FETCH the data from the cursor into PL/SQL variables or records in the Execution Section.
4. CLOSE the cursor in the Execution Section before you end the PL/SQL Block.

What does cursor mean in SQL?

In computer science, a database cursor is a mechanism that enables traversal over the records in a database. In SQL procedures, a cursor makes it possible to define a result set (a set of data rows) and perform complex logic on a row by row basis.

What is cursor explain with example?

Cursor is a Temporary Memory or Temporary Work Station. It is Allocated by Database Server at the Time of Performing DML(Data Manipulation Language) operations on Table by User. Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.

What do you mean by cursor in SQL?

A SQL cursor is a database object that retrieves data from result sets one row at a time. The cursor in SQL can be used when the data needs to be updated row by row. A SQL cursor is a database object that is used to retrieve data from a result set one row at a time. This article explains everything about SQL cursors.

What is cursor variable in Oracle PL SQL?

A cursor variable is a cursor that contains a pointer to a query result set. The result set is determined by execution of the OPEN FOR statement using the cursor variable. The same cursor variable can be opened a number of times with separate OPEN FOR statements containing different queries. …

What is the use of cursor in Oracle stored procedure?

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 difference between procedure and cursor?

A function or procedure is a set of instructions to perform some task. A cursor is an array that can stores the result set of a query. Stored procedures are pre-compiled objects and executes as bulk of statements, whereas cursors are used to execute row by row.