Define Simple/Explicit , Parametric and Internal/Implicit cursor

Define Simple/Explicit , Parametric and Internal/Implicit cursor.

- A Cursor is a PL/SQL construct and accesses the stored information in a named work area.

There are 2 types of cursors:

1. Implicit cursor:

- PL/SQL creates an implicit cursor whenever an SQL statement is executed through the code, unless the code employs an explicit cursor.

- The developer does not explicitly declare the cursor, thus, known as implicit cursor.

In the following UPDATE statement, which gives everyone in the company a 20% raise, PL/SQL creates an implicit cursor to identify the set of rows in the table which would be affected.
SET salary = salary * 1.2;

2. Explicit cursor:

- It can be declared by us for the queries that return more than one row.

- The cursor names here are the unnamed work area in which the database stores processing information when it executes a multiple-row query.

- When you have named the work area, you can access its information, and process the rows of the query individually.
What is an SQL *FORMS?
Oracle Forms is part of Oracle's Internet Developer Suite. Its earlier versions were called SQL*Forms....
How do you control the constraints in forms?
You can suppress or customize error messages in Forms. This can be done by setting the message level of the system variable SYSTEM.MESSAGE_LEVEL....
When will ON-VALIDATE-FIELD trigger executed?
ON-VALIDATE-FIELD triggers are used for field validation. It fires when the field validation status is New or changed.......
Post your comment