mysql按字段分組並獲取每個分組按照某個字段排序的前三條

這是原始數據 想按照brand_id分組 並獲取每個分組total_num最高的前3位

SQL語句為：

select a.* from data a where 3 > (select count(*) from data where brand_id = a.brand_id and total_num > a.total_num ) order by a.brand_id, a.total_num desc;

得到結果