関連ワード:  sql server select top record each group    sql server select first record of each group    sql server select top row of each group    sql server select first row per group    sql server select top 1 record from each group    sql server select first row from each group    sql server select first record in a group    sql server select top n rows per group category    sql server select first and last record of each group    select top 1 per group sql  
結果 : sql server select top record each group