Question

这是当前表中的所有数据

SELECT
  id,harga,kode_tahun_ajaran
FROM
  tblharga
+----+---------+-------------------+
| id | harga   | kode_tahun_ajaran |
+----+---------+-------------------+
|  1 |  400000 | THN2018/2019      |
|  2 |   50000 | THN2018/2019      |
|  3 | 1000000 | THN2018/2019      |
|  4 |  900000 | THN2018/2019      |
|  5 |  500000 | THN2017/2018      |
|  6 |  600000 | THN2018/2019      |
+----+---------+-------------------+

并且我运行此代码以分组 kode_tahun_ajaran 来获取最后一个 harga

  SELECT
    id,harga,kode_tahun_ajaran
  FROM
    tblharga
  GROUP BY
    kode_tahun_ajaran
  ORDER BY id DESC
+----+--------+-------------------+
| id | harga  | kode_tahun_ajaran |
+----+--------+-------------------+
|  5 | 500000 | THN2017/2018      |
|  1 | 400000 | THN2018/2019      |
+----+--------+-------------------+

harga 列应获取最后的600000数据，这是由于 order by 代码所致。< / p>

如何通过另一种方式对最新数据进行分组？预先感谢。

Answer 1

您可以在下面尝试

SELECT
    id,harga,kode_tahun_ajaran
  FROM
    tblharga where id in (select max(id) from tblharga group by kode_tahun_ajaran)

Answer 2

select id,S.kode_tahun_ajaran,harga
from tblharga S inner join
( select kode_tahun_ajaran,max(id) maxid from tblharga group by kode_tahun_ajaran) T
where T.kode_tahun_ajaran=S.kode_tahun_ajaran and maxid=id;

GROUP和ORDER Mysql在列中获取不同的数据

2 个答案: