Question: What Is Cursor In PL SQL With Examples?

What is a cursor on a computer?

In computer user interfaces, a cursor is an indicator used to show the current position for user interaction on a computer monitor or other display device that will respond to input from a text input or pointing device.

The mouse cursor is also called a pointer, owing to its resemblance in usage to a pointing stick..

What is the hand cursor called?

What is the cursor? … It is also called a pointer, but today pointer refer to a specific cursor, the one that looks like a hand with an extended index finger.

How do I run a cursor in SQL?

To use cursors in SQL procedures, you need to do the following:Declare a cursor that defines a result set.Open the cursor to establish the result set.Fetch the data into local variables as needed from the cursor, one row at a time.Close the cursor when done.

What is cursor in SQL Server with example?

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. … Introduction to SQL cursor. Cursor life cycle.

What is a cursor explain the types of cursor with an example?

Cursor is a Temporary Memory or Temporary Work Station. It is Allocated by Database Server at the Time of Performing DML operations on Table by User. … There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors. These are explained as following below.

What is trigger in PL SQL with examples?

Trigger is invoked by Oracle engine automatically whenever a specified event occurs. Trigger is stored into database and invoked repeatedly, when specific condition match. A database manipulation (DML) statement (DELETE, INSERT, or UPDATE). … A database definition (DDL) statement (CREATE, ALTER, or DROP).

What is cursor in SQL?

A cursor in SQL is a temporary work area created in system memory when a SQL statement is executed. A SQL cursor is a set of rows together with a pointer that identifies a current row. It is a database object to retrieve data from a result set one row at a time.

How do you write a cursor?

Declare a cursor Before using an explicit cursor, you must declare it in the declaration section of a block or package as follows: CURSOR cursor_name IS query; In this syntax: First, specify the name of the cursor after the CURSOR keyword.

What is the use of cursor in Plsql?

The ‘Cursor’ is the PL/SQL construct that allows the user to name the work area and access the stored information in it. The major function of a cursor is to retrieve data, one row at a time, from a result set, unlike the SQL commands which operate on all the rows in the result set at one time.

What are the different types of cursor?

SQL Server Different Types of CursorsStatic Cursors. A static cursor populates the result set at the time of cursor creation and the query result is cached for the lifetime of the cursor. … Dynamic Cursors. … Forward Only Cursors. … Keyset Driven Cursors.

What is trigger and cursor?

A trigger is a procedure (code segment) that is executed automatically when some specific events occur in a table/view of a database, while a cursor is a control structure used in databases to go through the database records. A cursor can be declared and used within a trigger.

How do I change my cursor type?

To change the mouse pointer (cursor) image:In Windows, search for and open Change how the mouse pointer looks.In the Mouse Properties window, click the Pointers tab. To choose a new pointer image: In the Customize box, click the pointer function (such as Normal Select), and click Browse. … Click OK to save your changes.

What is cursor example?

Oracle creates a memory area, known as the context area, for processing an SQL statement, which contains all the information needed for processing the statement; for example, the number of rows processed, etc. A cursor is a pointer to this context area.

What is cursor in database with example?

A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor contains information on a select statement and the rows of data accessed by it. This temporary work area is used to store the data retrieved from the database, and manipulate this data.

Which one best describes why cursor is used?

Cursors are used by database programmers to process individual rows returned by database system queries. … 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.