IS vs AS keywords for PL/SQL Oracle Function or Procedure Creation [duplicate]

This question already has answers here: What is the difference between "AS" and "IS" in an Oracle stored procedure? (6 answers) 开发者_JAVA技巧 Closed 9 years ago.

I have been trying to find out what the difference is between the IS and AS keywords in PL/SQL when creating an Oracle function or procedure.

I have searched and have been unable to find any information on this. Does anyone know the difference?

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I've never known there to be a difference. The Oracle documentation implies that they are synonyms:

The function body begins with the keyword IS (or AS) and ends with the keyword END followed by an optional function name.

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Same as DISTINCT and UNIQUE in select statements. i.e, there is no material difference between 'IS' and 'AS'. Backwards compatibility and meeting standards