How can we write cursor in procedure in PL SQL?

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

1. Declare a cursor that defines a result set.
2. Open the cursor to establish the result set.
3. Fetch the data into local variables as needed from the cursor, one row at a time.
4. Close the cursor when done.

What is cursor in PL SQL with examples?

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.

How do I use two cursors in PL SQL?

DECLARE AA NUMBER; CURSOR S IS SELECT ENAME, SAL FROM EMP; CURSOR D IS SELECT ENAME, SAL FROM EMP; NAME EMP. ENAME%TYPE; SALARY EMP. SAL%TYPE; C NUMBER; BEGIN AA := :NUMBER_OF_EMP; SELECT COUNT(EMPNO) INTO C FROM EMP; OPEN S; FOR A IN 1..AA LOOP FETCH S INTO NAME, SALARY; DBMS_OUTPUT.

What is cursor in Oracle stored procedure?

create or replace PROCEDURE get_new AS my_ename INTERFACE_ATTLAS. TRAFFIC_CUST_ID%TYPE; my_salary INTERFACE_ATTLAS. ROUTERNAME%TYPE; CURSOR c1 IS SELECT TRAFFIC_CUST_ID,ROUTERNAME FROM INTERFACE_ATTLAS WHERE rownum > 3; BEGIN open c1; LOOP FETCH c1 INTO my_ename, my_salary; EXIT WHEN c1%NOTFOUND; DBMS_OUTPUT.

Can we write cursor inside procedure?

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.

Can we call cursor inside cursor?

The trick to declaring a cursor within a cursor is that you need to continue to open and close the second cursor each time a new record is retrieved from the first cursor. That way, the second cursor will use the new variable values from the first cursor.

Can we use subquery in cursor?

Using Cursor Subqueries You can use cursor subqueries, also know as cursor expressions, to pass sets of rows as parameters to functions.

Can we declare cursor inside begin?

In general, yes you can, you just nest another execution block inside your current one…

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.

How to write and use cursors in SQL Server stored procedure?

How to write and use Cursors in SQL Server Stored Procedure? Following is an example of simple Cursor in SQL Server Stored Procedure which prints all the records of Customers table. SET ANSI_NULLS ON.

What happens when you open the cursor in PL / SQL?

The name of this context area is same as the cursor name. Opening the cursor will instruct the PL/SQL to allocate the memory for this cursor. It will make the cursor ready to fetch the records. In this process, the ‘SELECT’ statement is executed and the rows fetched is stored in the allocated memory. These are now called as active sets.

How is a cursor loop used in SQL?

Introduction to PL/SQL Cursor Loop PL/SQL cursor loop statement is used for fetching and processing each and every record one by one which is referred to by a cursor. The FOR LOOP is used by the cursor for carrying out the repetitive task of processing the records retrieved from the cursor reference.

Where do you create an explicit cursor in SQL?

Explicit cursors are programmer-defined cursors for gaining more control over the context area. An explicit cursor should be defined in the declaration section of the PL/SQL Block. It is created on a SELECT Statement which returns more than one row.