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??
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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Sis an alias ofstation. TheFROMclause is definingstationas that aliasS. With it defined this waystation.{field}isn't valid, onlyS.{field}is.