Question

我在查询中有一个Crystal输出，记录集是：

DATE        TIME        FLOC    VALUE
01/07/2015              AAA 
02/07/2015  01:30:00    AAA     00MC
02/07/2015  03:30:00    AAA     00SE
03/07/2015              AAA 
04/07/2015              AAA 
05/07/2015              AAA 
06/07/2015              AAA 
07/07/2015              AAA 
08/07/2015  08:00:00    AAA     00MP
08/07/2015  14:00:00    AAA     00SE
01/07/2015              BBB 
02/07/2015  09:30:00    BBB     00MP
02/07/2015  16:30:00    BBB     00SE
03/07/2015              BBB 
04/07/2015              BBB 
05/07/2015              BBB 
06/07/2015              BBB

我想根据上下文评估创建一个具有先前值的附加列：

FOR same DATE and FLOC 
IF TIME <= "04:00:00" THEN CHECK = VALUE
ELSE CHECK = DATE-1 VALUE

获得这样的东西：

DATE        TIME        FLOC    CHECK   VALUE
01/07/2015              AAA     
02/07/2015  01:30:00    AAA     00MC    00MC
02/07/2015  03:30:00    AAA     00SE    00SE
03/07/2015              AAA     00SE
04/07/2015              AAA     00SE
05/07/2015              AAA     00SE
06/07/2015              AAA     00SE
07/07/2015              AAA     00SE
08/07/2015  08:00:00    AAA     00SE    00MP
08/07/2015  14:00:00    AAA     00SE    00XX
01/07/2015              BBB     
02/07/2015  09:30:00    BBB             00MP
02/07/2015  16:30:00    BBB             00XX
03/07/2015              BBB     00MP
04/07/2015              BBB     00MP
05/07/2015              BBB     00MP
06/07/2015              BBB     00MP
07/07/2015              BBB     00MP
08/07/2015              BBB     00MP
01/07/2015              CCC     
02/07/2015  22:30:00    CCC             00MC
02/07/2015  23:30:01    CCC             00MC
03/07/2015              CCC     00MC
04/07/2015              CCC     00MC
05/07/2015  23:00:00    CCC     00MC    00YY
06/07/2015  01:00:00    CCC     00SE    00SE
07/07/2015              CCC     00SE
08/07/2015              CCC     00SE

关于如何在Crystal上处理这个问题的任何想法？非常感谢。亲切的 S上。

Answer 1

我已经使用Previous（）函数+ EvaluateAfter（）作为上下文env。 THX。

Crystal Report - 收集特定上下文的先前值

1 个答案: