greenplum秒转成时分秒

gp将秒转成时分秒

case 
when col >= 3600 then 
    case when col%3600 > 60 then col/3600||'h'||col%3600/60||'m'||col%3600/60||'s' 
	else col/3600||'h'||col%3600/60||'s'
    end
when col >= 60 and col < 3600 then col/60||'m'||col%60||'s'
else col||'s' 
end as col