Keyword and parameter description in pl sql, PL-SQL Programming

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Keyword and Parameter Description:

label_name:

This is an undeclared identifier which optionally labels the PL/SQL block. When used, label_name should be enclosed by the double angle brackets and should appear at the beginning of the block. Optionally, label_name can also become visible at the end of the block.

The global identifier declared in an enclosing block can be re-declared in a sub-block, in that case the local declaration prevails and the sub-block cannot reference the global identifier. To reference the global identifier, you should use the block label to qualify the reference, as the illustration below shows:

<>

DECLARE

x INTEGER;

BEGIN

...

DECLARE

x INTEGER;

BEGIN

...

IF x = outer.x THEN -- refers to global x

...

END IF;

END;

END outer;


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