Is there a way to simulate VARCHAR2 datatype of other database systems?

You can emulate almost any database using domains. Varchars are a little bit tricky as they can have variable number of characters, but you can name your domains like that using quoted identifiers. Example:

CREATE DOMAIN "VARCHAR2(1)" AS VARCHAR(1);

Later, in table definition, you would use something like:

CREATE TABLE t1 (
x INTEGER,
c "VARCHAR2(1)"
);

As you can see, you must use quotes everywhere as '(' and ')' characters are reserved.

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