On 11-2-2014 21:54, Alan McDonald wrote: > Cast the result of the extract as a date or timestamp.
That doesn't work and that is ok: I'd be surprised when casting the result (= 20) of EXTRACT(hour from TIMESTAMP '2001-02-16 20:38:40') would result in 2001-02-16 20:00:00, while the result (= 2001) of EXTRACT(year FROM TIMESTAMP '2001-02-16 20:38:40') would result in 2001-01-01 00:00:00. The TS asked for an equivalent function, there is none in Firebird, although there is a workaround as demonstrated by Ismael. > > On 12/02/2014 6:20 AM, "Mark Rotteveel" <m...@lawinegevaar.nl > <mailto:m...@lawinegevaar.nl>> wrote: > > On 11-2-2014 16:06, Virna Constantin wrote: > > > > > > EXTRACT() > > http://www.firebirdsql.org/refdocs/langrefupd25-intfunc-extract.html > > Extract is not the same as PostgreSQL date_trunc. Extract returns the > requested value as an integer, while date_trunc returns a DATE or > TIMESTAMP truncated to the requested date field, example from > > http://www.postgresql.org/docs/current/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC > : > > SELECT date_trunc('hour', TIMESTAMP '2001-02-16 20:38:40'); > Result: 2001-02-16 20:00:00 > > SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40'); > Result: 2001-01-01 00:00:00 -- Mark Rotteveel
