Question

我是SQL新手，主要使用Power BI中查询中的数据。

我根据Status将我的日期列拆分为SQL中的两个日期列。（在状态发生变化的日子里）

我有一个SQL查询，它给我以下简单的结果

SERIAL NO         ENTITY_CODE COMPANY_NAME      STATUS       TRANSACTION_DATE
AB:CD:EF:GH:IJ:KL FRANCIS     MADICAL           Activation      27-04-12 18:30
AB:CD:EF:GH:IJ:KL DEADPOOL    FAST TRANSPORT    Disconnection   27-12-14 15:01
12345678901       DEADPOOL    FAST TRANSPORT    Activation      27-04-12 18:30
12345678901       DEADPOOL    FAST TRANSPORT    Disconnection   17-01-16 16:35
PQ:RS:TU:VW:XY:ZA DEADPOOL    FAST TRANSPORT    Activation      27-04-12 18:31
PQ:RS:TU:VW:XY:ZA DEADPOOL    FAST TRANSPORT    Disconnection   02-12-13 13:26
78901234567       BANDHU      BANDHU CABS       Activation      27-04-12 19:12
78901234567       BANDHU      BANDHU CABS       Disconnection   27-10-13 19:42
78901234567       DEADPOOL    FAST TRANSPORT    Reconnection    25-02-14 13:53
78901234567       DEADPOOL    FAST TRANSPORT    Disconnection   08-04-16 17:14

这是一个简单的'选择'查询，包含一些条件和'Order By'。

为了查找此序列号处于活动状态和已断开连接的天数，我需要以下述格式提供此数据。我需要Power BI。

SERIAL NO           ENTITY_CODE  COMPANY_NAME   STATUS          FromDate      ToDATE
AB:CD:EF:GH:IJ:KL   FRANCIS      MADICAL        Activation      27-04-12 18:30  27-12-14 15:01
AB:CD:EF:GH:IJ:KL   DEADPOOL     FAST TRANSPORT Disconnection   27-12-14 15:01  TODAY'S DATE
12345678901         DEADPOOL     FAST TRANSPORT Activation      27-04-12 18:30  17-01-16 16:35
12345678901         DEADPOOL     FAST TRANSPORT Disconnection   17-01-16 16:35  TODAY'S DATE
PQ:RS:TU:VW:XY:ZA   DEADPOOL     FAST TRANSPORT Activation      27-04-12 18:31  02-12-13 13:26
PQ:RS:TU:VW:XY:ZA   DEADPOOL     FAST TRANSPORT Disconnection   02-12-13 13:26  TODAY'S DATE
78901234567         BANDHU       BANDHU CABS    Activation      27-04-12 19:12  27-10-13 19:42
78901234567         BANDHU       BANDHU CABS    Disconnection   27-10-13 19:42  25-02-14 13:53
78901234567         DEADPOOL     FAST TRANSPORT Reconnection    25-02-14 13:53  08-04-16 17:14
78901234567         DEADPOOL     FAST TRANSPORT Disconnection   08-04-16 17:14  TODAY'S DATE

请注意ToDate专栏中的“今天的日期”。这个数据最终会给我这个数字生命中每一天的每个序列号的状态。

我需要根据每个交易日期划分“交易历史记录”，以便我能够发现某个序列号从date1到date2处于活动状态，然后从日期2到日期3断开连接，依此类推< / p>

有人可以帮忙吗？

Answer 1

您的FromDate似乎与TransactionDate相同，ToDate是下一个TransactionDate，但序列号相同。

您应该能够在Power BI内部使用DAX创建计算列，以获取ToDate。类似于以下内容，其中Status是您的表名。

ToDate =
    VAR EndDate = MINX(
                      FILTER('Status',
                          'Status'[Serial No] = EARLIER('Status'[Serial No]) &&
                          'Status'[TransactionDate] > EARLIER('Status'[TransactionDate])),
                      'Status'[TransactionDate])
    RETURN IF(ISBLANK(EndDate), TODAY(), EndDate)

使用CALCULATE代替MINX的另一个版本：

ToDate = 
    VAR EndDate = CALCULATE(
                      MIN('Status'[TransactionDate]),
                      ALL('Status'),
                      'Status'[Serial No] = EARLIER('Status'[Serial No]),
                      'Status'[TransactionDate] > EARLIER('Status'[TransactionDate]))
    RETURN IF(ISBLANK(EndDate),TODAY(),EndDate)

Answer 2

SELECT  
    SERIAL NO
        ,ENTITY_CODE COMPANY_NAME
        ,STATUS
        ,TRANSACTION_DATE
    ,CASE STATUS
        WHEN 'Activation' THEN <WHAT EVER YOU WANT TO HAPPEN>
        WHEN 'Disconnection' THEN <WHAT EVER YOU WANT TO HAPPEN>
        WHEN 'Reconnection' THEN <WHAT EVER YOU WANT TO HAPPEN>
        ELSE <WHAT EVER YOU WANT TO HAPPEN> 
        END as ToDATE
FROM 
    <Table Name>

Answer 3

看起来您想要选择大于当前交易日期且具有相同序列号的最小交易日期。如果没有匹配（在此示例中返回NULL），则返回今天的日期。

我使用了datetime数据类型，但看起来示例代码选择了varchar或char。我假设您正在使用正确的数据类型。

如果您有SQL Server Management Studio，可以尝试以下完整示例：

DECLARE @mytable TABLE ([SERIAL NO] varchar(100), ENTITY_CODE varchar(100), COMPANY_NAME varchar(100), [STATUS] varchar(100), TRANSACTION_DATE smalldatetime)
INSERT INTO @mytable VALUES
 ('AB:CD:EF:GH:IJ:KL', 'FRANCIS',  'MADICAL',        'Activation',    '2012-04-27 18:30:00')
,('AB:CD:EF:GH:IJ:KL', 'DEADPOOL', 'FAST TRANSPORT', 'Disconnection', '2014-12-27 15:01:00')
,('12345678901',       'DEADPOOL', 'FAST TRANSPORT', 'Activation',    '2012-04-27 18:30:00')
,('12345678901',       'DEADPOOL', 'FAST TRANSPORT', 'Disconnection', '2016-01-17 16:35:00')
,('PQ:RS:TU:VW:XY:ZA', 'DEADPOOL', 'FAST TRANSPORT', 'Activation',    '2012-04-27 18:31:00')
,('PQ:RS:TU:VW:XY:ZA', 'DEADPOOL', 'FAST TRANSPORT', 'Disconnection', '2013-12-02 13:26:00')
,('78901234567',       'BANDHU',   'BANDHU CABS',    'Activation',    '2012-04-27 19:12:00')
,('78901234567',       'BANDHU',   'BANDHU CABS',    'Disconnection', '2013-10-27 19:42:00')
,('78901234567',       'DEADPOOL', 'FAST TRANSPORT', 'Reconnection',  '2014-02-25 13:53:00')
,('78901234567',       'DEADPOOL', 'FAST TRANSPORT', 'Disconnection', '2016-04-08 17:14:00')

SELECT M1.[SERIAL NO], M1.ENTITY_CODE, M1.COMPANY_NAME, M1.[STATUS], M1.TRANSACTION_DATE AS FromDate
      ,COALESCE(
       (SELECT MIN(TRANSACTION_DATE)
          FROM @mytable M2
         WHERE M2.[SERIAL NO] = M1.[SERIAL NO]
           AND M2.TRANSACTION_DATE > M1.TRANSACTION_DATE
       ) 
               , getDate()
               ) AS ToDATE
  FROM @mytable M1

SQL - 将一个日期列转换为FromDate＆amp; ToDate列

3 个答案: