関連ワード:  sql server select first record of each group    sql server get first record of each group    sql server get first row of each group    sql server select top row of each group    sql server select first and last record of each group    sql server select top record each group    sql server get the first record of a group    sql server select first occurrence in each group    sql server select first record in a group    sql server select first row per group  
結果 : sql server select first record of each group