error

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Page: https://www.postgresql.org/docs/9.6/xfunc-sql.html
Description:

> hello
> 
> i've descovered a small error - instead of integer should be numeric
> 
> https://www.postgresql.org/docs/9.6/xfunc-sql.html 
> 
> CREATE FUNCTION tf1 (accountno integer, debit numeric) RETURNS integer AS
$$
>     UPDATE bank
>         SET balance = balance - debit
>         WHERE accountno = tf1.accountno;
>     SELECT balance FROM bank WHERE accountno = tf1.accountno;
> $$ LANGUAGE SQL;