如何比较来自同一列和不同行但相同 table 的值？

Question

我正在尝试获取特定帐户名称的开始日期不同的记录。我有以下示例数据。

示例数据脚本如下

create table Meter (AccountNumer varchar(50), MeterNumber varchar(50), StartDate date)
Insert into Meter Values('0142628117','123470203','4/22/2020')
Insert into Meter Values('0142628117','123470205','4/22/2020')
Insert into Meter Values('0160059948','100094717','4/24/2020')
Insert into Meter Values('0160059948','328144931','4/24/2020')
Insert into Meter Values('0500000178767001363445','TCA105238304','10/2/2018')
Insert into Meter Values('0500000178767001363445','TCA130359929','8/12/2019')
Insert into Meter Values('0500071816677001432356','1ND386803501','8/20/2019')
Insert into Meter Values('0500071816677001432356','99D024666064','7/18/2019')


RowNo   AccountNumber           MeterNumber     StartDate
    1   0500000178767001363445  TCA105238304    10/2/2018
    2   0500000178767001363445  TCA130359929    8/12/2019
    3   0160059948              100094717       4/24/2020
    4   0160059948              328144931       4/24/2020
    5   0500071816677001432356  1ND386803501    8/20/2019
    6   0500071816677001432356  99D024666064    7/18/2019
    7   0142628117              123470203       4/22/2020
    8   0142628117              123470205       4/22/2020

我试图只获取帐号开始日期不同的记录（两行）。所以我期望的结果如下 table.

预期结果

RowNo   AccountNumber           MeterNumber     StartDate
    1   0500000178767001363445  TCA105238304    10/2/2018
    2   0500000178767001363445  TCA130359929    8/12/2019
    5   0500071816677001432356  1ND386803501    8/20/2019
    6   0500071816677001432356  99D024666064    7/18/2019

任何帮助将不胜感激。

Answer 1

您可以为此使用 window 函数。

我们只是按 AccountNumber 对结果进行分区，并检查每个分区的最大值和最小值 StartDate 是否不同。

SELECT *
FROM (
    SELECT *,
      MinDate = MIN(m.StartDate) OVER (PARTITION BY m.AccountNumber),
      MaxDate = MAX(m.StartDate) OVER (PARTITION BY m.AccountNumber)
    FROM Meter m
) m
WHERE MinDate <> MaxDate;

Answer 2

你可以试试下面的查询

select ROW_NUMBER() OVER(ORDER BY m.AccountNumer)RowNo    , m.AccountNumer,m.MeterNumber,m.StartDate 
from meter m
INNER JOIN meter n ON m.AccountNumer=n.AccountNumer
and m.StartDate <> n.StartDate

如果您遇到任何问题或需要进行任何更改，请告诉我。

如何比较来自同一列和不同行但相同 table 的值？

How do I compare values from same column and different row but same table?

sql-server

sql-server-2008

sql-server-2005

sql-server-2012