title: how do I find median in sql (code question)
body: <p>I find answers below:
  Select round(S.LAT_N,4) mediam from station S where (select count(Lat_N) from station where Lat_N &lt; S.LAT_N ) = (select count(Lat_N) from station where Lat_N &gt; S.LAT_N)</p>
  <p>I'm confused at where S come from??</p>