* postgresql-9.6-A4.pdf, page 891 * https://www.postgresql.org/docs/9.6/static/xfunc-sql.html#XFUNC-SQL-BASE-FUNCTIONS
Dear Doc Writers,
Would it not be better to change the return type of the following two sample
functions to numeric ?
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;
CREATE FUNCTION tf1 (accountno integer, debit numeric) RETURNS integer AS $$
UPDATE bank
SET balance = balance - debit
WHERE accountno = tf1.accountno
RETURNING balance;
$$ LANGUAGE SQL;
Since debit is of type numeric, balance is (probably) numeric too, so the
function ought to return numeric. I guess that the function works as it is
using implicit type cast.
With best regards,
Nikolaus Thiel
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