Is there any Specific rule for using "IS" and "AS" keyword?

Hi,
i am confused about the use of these two keywords "IS" and "AS".It seems to me they are used randomly anywhere in procedure,package or triggers etc..
Is there any rule for there usages , or only way is to remember the actual syntax whenever they are used ?

They are generally interchangeable, so you can use whichever you choose.
In the English language we say that "some object IS" and "do an action AS" so, for example...
in a package if we define a type it reads better as:
TYPE mytype IS TABLE OF NUMBER;because we are saying that this type called mytype IS a table of numbers.
but if we were to create the type on the database we would use e.g.
CREATE OR REPLACE TYPE mytype AS RECORD (x number, y number);because we are saying that we are creating (action) a type called mytype AS a record.
Just a slight difference in grammatical meaning, but Oracle isn't bothered if you choose to use the other one in most cases.

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