从位掩码确定星期几

Question

我正在使用第三方应用程序，并试图根据数据提取有关班次信息的有意义的信息。

shift_pattern_start_dt     pattern
2014-05-27                 1111000
2015-10-25                 1110011

2014-05-27 是Tuesday 模式的起始位置是Tuesday。所以我希望结果显示Tuesday、Wednesday、Thursday 和Friday。

2015-10-25 是一个Sunday，这个模式的起始位置是Sunday。结果应该是Sunday、Monday、Tuesday、Friday和Saturday。

对于确定正确工作日有什么想法或建议？

Answer 1

Declare @YourTable table (shift_pattern_start_dt date, pattern varchar(25))
Insert Into @YourTable values
('2014-05-27','1111000'),
('2015-10-25','1110011')

Select *
      ,NewCol = concat(
                IIF(substring(pattern,1,1)='1',   +DateName(WEEKDAY,shift_pattern_start_dt),'')
               ,IIF(substring(pattern,2,1)='1',','+DateName(WEEKDAY,dateadd(DAY,1,shift_pattern_start_dt)),null)
               ,IIF(substring(pattern,3,1)='1',','+DateName(WEEKDAY,dateadd(DAY,2,shift_pattern_start_dt)),null)
               ,IIF(substring(pattern,4,1)='1',','+DateName(WEEKDAY,dateadd(DAY,3,shift_pattern_start_dt)),null)
               ,IIF(substring(pattern,5,1)='1',','+DateName(WEEKDAY,dateadd(DAY,4,shift_pattern_start_dt)),null)
               ,IIF(substring(pattern,6,1)='1',','+DateName(WEEKDAY,dateadd(DAY,5,shift_pattern_start_dt)),null)
               ,IIF(substring(pattern,7,1)='1',','+DateName(WEEKDAY,dateadd(DAY,6,shift_pattern_start_dt)),null)
               )
 From  @YourTable

返回

shift_pattern_start_dt  pattern   NewCol
2014-05-27              1111000   Tuesday,Wednesday,Thursday,Friday
2015-10-25              1110011   Sunday,Monday,Tuesday,Friday,Saturday

编辑 - 交叉应用版本

Select A.*
      ,B.*
 From  @YourTable A
 Cross Apply (
                Select NewCol =Stuff((Select ',' +D 
                  From (
                        Select N,D = IIF(substring(A.pattern,N,1)='0',null,DateName(WEEKDAY,DateAdd(DAY,N-1,A.shift_pattern_start_dt)))
                         From (Values (1),(2),(3),(4),(5),(6),(7)) N(N)             
                        ) B1 
                  For XML Path ('')),1,1,'') 
             ) B

Concat() 方法的执行计划

交叉应用方法的执行计划