[postgis-users] select point in linestring

[searchelite]

Dear All, I have a linestring that constructed from many points, my question
is how can i identify(select) one of the point from the linestring. I know
there is ST_POINTN(geometry,integer) that Return the N’th point in the first
linestring in the geometry. But with ST_POINTN, i have to know the number of
the points in order to return the geometry of the points. is there any other
function beside ST_POINTN that can return point geometry without have to
know the index number of the points? 

I hope all of you can understand my question..thank you in advance
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