2012-03-12から1日間の記事一覧
mysqlの副問合せで、上位?件の平均を算出しようとしたら select avg(val) from (select val from measure_0_hour_day_201202 where member_id=1 order by val desc limit 3) ERROR 1248 (42000): Every derived table must have its own alias と、「きちん…
mysqlの副問合せで、上位?件の平均を算出しようとしたら select avg(val) from (select val from measure_0_hour_day_201202 where member_id=1 order by val desc limit 3) ERROR 1248 (42000): Every derived table must have its own alias と、「きちん…