On 26 January 2012 15:37, Jon Smark
<jon.smark@yahoo.com> wrote:
Hi,
Is it possible to do the equivalent of let-bindings in a pure SQL function?
I have a SELECT that invokes "now" multiple times. It would be nicer
to do it only once and reuse the value. Something like this:
LET right_now = SELECT now () IN
SELECT * FROM my_table WHERE right_now >= start AND ...
In PL/pgSQL this is easy, but I wonder about SQL...
Thanks in advance!
Jon
In fact now() is a little bit tricky here. now() returns the time when the transaction started, so if you run `begin;` and call now() multiple times (even in different queries, but within the same transaction), the function will return the same value.
regards
Szymon