根据字段过滤重复行 [英] Filter duplicate rows based on a field

问题描述

我有几条记录(账单)基本上是相互重复的，只有一个字段代表账单所用的语言.

I have several records (bills) that are basically duplicates of each other, except for one field, which represents the language that bill is in.

例如:

ID,BillID,Account,Name,Amount,Lang
1,0001,abcd,John Smith,10.99,ENG
2,0002,qwer,Jane Doe,9.99,ENG
3,0001,abcd,John Smith,10.99,SPA
4,0003,abcd,John Smith,4.99,CHI

所有字段都是字符串，除了 ID，它是一个自动编号.

All fields are strings, except ID, which is an autonumber.

在我的 SQL 选择中，我有

In my SQL select, I have

SELECT * 
FROM Bills 
WHERE Account='abcd'

它总共返回 3 行，但对于同一张帐单返回 2 行.我需要返回特定帐户的唯一帐单.所以在上面的场景中，我想检索 2 个账单，账单 ID 为 0003，SPA 或 ENG 版本为 0001，但不能同时检索.

and it returns 3 rows in total, but 2 rows for the same bill. I need to return unique bills for a specific account. So in the scenario above, I want to retrieve 2 bills with billID 0003 and either SPA or ENG version of 0001, but not both.

查询会是什么?

谢谢

我不能依赖于始终存在的特定语言.例如，我不能说 SELECT * FROM Bills WHERE Account='abcd' AND Lang='ENG' 因为有时账单可能只有一种语言，而不是 ENG，有时可能是多种语言的任意组合.

I cannot rely on a specific language always being there. For example, I cannot say SELECT * FROM Bills WHERE Account='abcd' AND Lang='ENG' because sometimes a bill may be only in one language, which is not ENG, and sometimes may be in several languages in any combination.

推荐答案

可能最简单的方法是使用 ROW_NUMBER 和 PARTITION BY

Probably the easiest way would be to use ROW_NUMBER and PARTITION BY

SELECT * FROM (
   SELECT b.*,
   ROW_NUMBER() OVER (PARTITION BY BillID ORDER BY Lang) as num
   FROM Bills b
   WHERE Account = 'abcd'
) tbl
WHERE num = 1

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