String handling function, substring vs. substr - Mailing list pgsql-general

Hi all,

I want to call one of the two functions above many times (in an aggregate
function) and it says in the manual pages that substr is the same as
substring.

Does this mean that substr calls substring internally?? Or is it the other
way around?? Or are they independent of each other??

So in short, which is faster to use??

Thanks,

Archie