I find answers below: Select round(S.LAT_N,4) mediam from station S where (select count(Lat_N) from station where Lat_N < S.LAT_N ) = (select count(Lat_N) from station where Lat_N > S.LAT_N)
I'm confused at where S come from??
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`S` is an alias of 'station`. The `FROM` clause is defining it as that alias. – danblack Jan 21 '21 at 02:46
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S is an alias of station. The FROM clause is defining station as that alias S. With it defined this way station.{field} isn't valid, only S.{field} is.
danblack
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