Frequent question: What is enclosing block in PL SQL?

What is nested block in Plsql?

As stated earlier, a PL/SQL block contains a declare section and a code section. A block can contain other blocks and these blocks are termed nested blocks. A nested block may have an optional declare and exception section. A nested block is seen as a single statement to the outer block.

What is block in PL SQL?

The basic program unit in PL/SQL is the block. A PL/SQL block is defined by the keywords DECLARE , BEGIN , EXCEPTION , and END . These keywords partition the block into a declarative part, an executable part, and an exception-handling part.

Which block not belong to PL SQL?

The anonymous block is the simplest unit in PL/SQL. It is called anonymous block because it is not saved in the Oracle database. Let’s examine the PL/SQL block structure in greater detail. The anonymous block has three basic sections that are the declaration, execution, and exception handling.

What does an unhandled exception do in PL SQL?

That is, the exception reproduces itself in successive enclosing blocks until a handler is found or there are no more blocks to search. If no handler is found, PL/SQL returns an unhandled exception error to the host environment. Exceptions cannot propagate across remote procedure calls done through database links.

THIS IS IMPORTANT:  Your question: What language is most similar to Java?

What are the two types of PL SQL blocks?

Types of PL/SQL Blocks

  • Anonymous Block.
  • Named Block.

Why is PL SQL used?

Function. The purpose of a PL/SQL function is generally used to compute and return a single value. This returned value may be a single scalar value (such as a number, date or character string) or a single collection (such as a nested table or array).

What are the features of PL SQL?

Features of PL/SQL

  • PL/SQL is tightly integrated with SQL.
  • It offers extensive error checking.
  • It offers numerous data types.
  • It offers a variety of programming structures.
  • It supports structured programming through functions and procedures.
  • It supports object-oriented programming.

How does PL SQL work?

PL/SQL extends SQL by adding constructs found in procedural languages, resulting in a structural language that is more powerful than SQL. The basic unit in PL/SQL is a block. All PL/SQL programs are made up of blocks, which can be nested within each other. Typically, each block performs a logical action in the program.

What are triggers in PL SQL?

A PL/SQL trigger is a named database object that encapsulates and defines a set of actions that are to be performed in response to an insert, update, or delete operation against a table. Triggers are created using the PL/SQL CREATE TRIGGER statement.

Is declare mandatory in PL SQL?

2 Answers. Following is the syntax for creating a pl/sql procedure. Declaration of variable and cursor is on need basis and is not mandatory.

Categories PHP