我在MS Access中有以下查询:
SELECT Sum(FS) AS FS_sum, Sum(FSOF) AS FSOF_sum
FROM tbl_G_elomkv_atp AS tt
WHERE tt.ID_A = 19
我现在想进一步细化,并根据表PK_G
中的自动编号PK只汇总最近15条记录。
仅添加“前15名”和“排序依据”给我一个“域汇总”错误,因此我将代码修改为:
SELECT TOP 15 Sum(FS) AS FS_sum, Sum(FSOF) AS FSOF_sum
FROM tbl_G_elomkv_atp as tt
WHERE tt.ID_A = 19
GROUP BY tt.PK_G
ORDER BY tt.PK_G DESC
但是,这将为15条记录中的每条记录提供一行。如何返回具有两个和值FS_sum
和FSOF_sum
的一行?
答案 0 :(得分:1)
使用子查询:
SELECT Sum(FS) AS FS_sum, Sum(FSOF) AS FSOF_sum
FROM (SELECT TOP 15 tt.*
FROM tbl_G_elomkv_atp AS tt
WHERE tt.ID_A = 19
ORDER BY tt.PK_G DESC
) as tt