MS Access 重启编号序列 [英] MS Access Restart Number Sequence

问题描述

尝试在 MS Access 中进行序列计数，其中计数序列根据另一个字段重置，如下示例，试图找出 ColB:

trying to do a sequence count in MS Access where the count sequence resets based on another field, so example below, trying to figure out ColB:

ColA ColB
4566 1
5677 1
5677 2
5677 3
8766 1
8766 2
1223 1

认为它可能与 DCount() 函数有关，不确定.非常感谢您的帮助...谢谢！

Think it might have something to do with the DCount() function, unsure. Would very much appreciate the help ... Thanks!

推荐答案

在 Access 查询中计算组序列号是相当常见的话题.需要唯一标识符字段，应提供自动编号.

Calculating a group sequence number in Access query is fairly common topic. Requires a unique identifier field, autonumber should serve.

使用 DCount():

Using DCount():

SELECT *, DCount("*", "table", "ColA=" & [ColA] & "AND ID<" & ID) + 1 AS GrpSeqFROM表;

或者使用相关子查询:

SELECT *, (SELECT Count(*) FROM table AS D WHERE D.ColA=table.ColA AND D.ID

在查询中计算的另一种方法是在带有排序和排序的报表上使用文本框的 RunningSum 属性.分组设置.

An alternative to calculating in query is to use RunningSum property of textbox on a Report with Sorting & Grouping settings.

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