Hello,
The pg_catalog.concat() is defined as STABLE function.
As per my understanding a STABLE function cannot modify the database and is
guaranteed to return the same results given the same arguments for all rows
within a single statement.
Example:
current_timestamp family of functions qualify as stable, since their values
do not change within a transaction.
An IMMUTABLE function cannot modify the database and is guaranteed to return
the same results given the same arguments forever.
why was STABLE preferred for concat() over IMMUTABLE?
-----
Regards,
Vinayak,
--
View this message in context: http://postgresql.1045698.n5.nabble.com/CONCAT-function-tp5817884.html
Sent from the PostgreSQL - general mailing list archive at Nabble.com.