関連ワード:  select top 1 row sql    select top first row sql    select top 1 record sql    select top 1 row in sql server    select only top 1 row sql    select top 1 record in sql server    select top 1 row in oracle sql    select top 1 row group by sql    sql select top 1 row per group    select top 1 row from each group sql server