datefunc.hlp

关系型数据库 Postgresql 6.5.2

.pgaw:Help.f.t insert end \
"DateTime functions\n\n" {title} \
"abstime(datetime) " {bold} "
	Returns: abstime 
	convert to abstime 

" {} "age(datetime,datetime) " {bold} "
	Returns: timespan 
	preserve months and years 

" {} "datetime(abstime) " {bold} "
	Returns: datetime 
	convert to datetime 

" {} "datetime(date) " {bold} "
	Returns: datetime 
	convert to datetime 

" {} "datetime(date,time) " {bold} "
	Returns: datetime 
	convert to datetime 

" {} "date_part(text,datetime) " {bold} "
	Returns: float8 
	portion of date 

" {} "date_part(text,timespan) " {bold} "
	Returns: float8 
	portion of time 

" {} "date_trunc(text,datetime) " {bold} "
	Returns: datetime 
	truncate date 

" {} "isfinite(abstime) " {bold} "
	Returns: bool 
	a finite time? 

" {} "isfinite(datetime) " {bold} "
	Returns: bool 
	a finite time? 

" {} "isfinite(timespan) " {bold} "
	Returns: bool 
	a finite time? 

" {} "reltime(timespan) " {bold} "
	Returns: reltime 
	convert to reltime 

" {} "timespan(reltime) " {bold} "
	Returns: timespan 
	convert to timespan 


" {} \
"PostgreSQL functions\n" {link pgfunctions} \
"Next - geometric functions" {link geomfunc}