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 are the two types of cursors in PL SQL?

PL/SQL has two types of cursors: implicit cursors and explicit cursors.

What are the different types of cursor in PL SQL with example?

Oracle PL/SQL Cursor: Implicit, Explicit, For Loop with Example
Implicit Cursor.Explicit Cursor.Cursor Attributes.FOR Loop Cursor statement.

What is the use of cursor?

A cursor keeps track of the position in the result set, and allows you to perform multiple operations row by row against a result set, with or without returning to the original table. In other words, cursors conceptually return a result set based on tables within the databases.

What is difference between trigger and cursor?

A cursor is activated and thus created in response to any SQL statement. A trigger is executed in response to a DDL statement, DML statement or any database operation.

What is a cursor in database?

A database cursor is an identifier associated with a group of rows. It is, in a sense, a pointer to the current row in a buffer. You must use a cursor in the following cases: Statements that return more than one row of data from the database server: A SELECT statement requires a select cursor.

Why cursors are used in PL SQL?

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. Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table.

What are the types of cursor in SQL?

SQL Server supports three cursor implementations.
Transact-SQL cursors. Transact-SQL cursors are based on the DECLARE CURSOR syntax and used mainly in Transact-SQL scripts, stored procedures, and triggers. Application programming interface (API) server cursors. Client cursors. Forward-only. Static. Keyset. Dynamic.

How do I create a cursor in SQL?

To work with cursors you must use the following SQL statements: DECLARE CURSOR. OPEN. FETCH.

Cursors in SQL procedures
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.

How many rows can a cursor hold?

A cursor can hold more than one row, but can process only one row at a time. The set of rows the cursor holds is called the active set.

What are PL SQL cursor exceptions?

An exception is an error condition during a program execution. PL/SQL supports programmers to catch such conditions using EXCEPTION block in the program and an appropriate action is taken against the error condition. There are two types of exceptions − System-defined exceptions.

What is cursor in SQL w3schools?

A cursor is a pointer to this private SQL area. It can be understood as a mechanism used to specify the name of a SELECT statement. It can further be used to modify the data within the SQL statement itself. Syntax: To declare a cursor.

What is the name of the cursor written and maintained by a database user?

The cursor which is automatically created, maintained and closed by the Oracle engine while execution of any DML(Data Manipulation Language) queries like INSERT , UPDATE or DELETE are called Implicit Cursor.