Update query, nested iif SET and joined tables

Question

Trying to make an Update Query with inner join and have the SET reflect the current month number.

Need help with syntax on updating a joined table that has columns for months, need to update the months that are Month(DATE()) +1,+2 only. Trying to use the below nested IIF as "IIF(Month(Date()) ="1",( SET table.c = table2.c2......) complete code below.

Syntax error is the result

Sample data to update sql table linked excel with values to use for updates

Update dbo_MasterSalesForecast_Test

INNER JOIN MasterSalesForecastUpdate

ON (dbo_MasterSalesForecast_Test.SubTo=MasterSalesForecastUpdate.Item) AND( dbo_MasterSalesForecast_Test.Planner=MasterSalesForecastUpdate.Planner)

IIF(Month(Date()) ="1",( SET

dbo_MasterSalesForecast_Test.[YY:1] = [MasterSalesForecastUpdate].[YYJan],

dbo_MasterSalesForecast_Test.[YY:2] = [MasterSalesForecastUpdate].[YYFan],

dbo_MasterSalesForecast_Test.[YY:3] = [MasterSalesForecastUpdate].[YYMar])

,

IIF(Month(Date())="2",( SET

dbo_MasterSalesForecast_Test.[YY:2]=[MasterSalesForecastUpdate].[YYFeb],

dbo_MasterSalesForecast_Test.[YY:3]=[MasterSalesForecastUpdate].[YYMar],

dbo_MasterSalesForecast_Test.[YY:4]=[MasterSalesForecastUpdate].[YYApr])

,

IIF(Month(Date())="3",( SET

dbo_MasterSalesForecast_Test.[YY:3]=[MasterSalesForecastUpdate].[YYMar],

dbo_MasterSalesForecast_Test.[YY:4]=[MasterSalesForecastUpdate].[YYApr],

dbo_MasterSalesForecast_Test.[YY:5]=[MasterSalesForecastUpdate].[YYMay])

,

IIF(Month(Date())="4",(SET

dbo_MasterSalesForecast_Test.[YY:4]=[MasterSalesForecastUpdate].[YYApr],

dbo_MasterSalesForecast_Test.[YY:5]=[MasterSalesForecastUpdate].[YYMay],

dbo_MasterSalesForecast_Test.[YY:6]=[MasterSalesForecastUpdate].[YYJun])

,

IIF(Month(Date())="5",(SET

dbo_MasterSalesForecast_Test.[YY:5]=[MasterSalesForecastUpdate].[YYMay],

dbo_MasterSalesForecast_Test.[YY:6]=[MasterSalesForecastUpdate].[YYJun],

dbo_MasterSalesForecast_Test.[YY:7]=[MasterSalesForecastUpdate].[YYJul])

,

IIF(Month(Date())="6",(SET

dbo_MasterSalesForecast_Test.[YY:6]=[MasterSalesForecastUpdate].[YYJun],

dbo_MasterSalesForecast_Test.[YY:7]=[MasterSalesForecastUpdate].[YYJul],

dbo_MasterSalesForecast_Test.[YY:8]=[MasterSalesForecastUpdate].[YYAug])

,

IIF(Month(Date())="7",(SET

dbo_MasterSalesForecast_Test.[YY:7]=[MasterSalesForecastUpdate].[YYJul],

dbo_MasterSalesForecast_Test.[YY:8]=[MasterSalesForecastUpdate].[YYAug],

dbo_MasterSalesForecast_Test.[YY:9]=[MasterSalesForecastUpdate].[YYSep])

,

IIF(Month(Date())="8",(SET

dbo_MasterSalesForecast_Test.[YY:8]=[MasterSalesForecastUpdate].[YYAug],

dbo_MasterSalesForecast_Test.[YY:9]=[MasterSalesForecastUpdate].[YYSep],

dbo_MasterSalesForecast_Test.[YY:10]=[MasterSalesForecastUpdate].[YYOct])

,

IIF(Month(Date())="9",(SET

dbo_MasterSalesForecast_Test.[YY:9]=[MasterSalesForecastUpdate].[YYSep],

dbo_MasterSalesForecast_Test.[YY:10]=[MasterSalesForecastUpdate].[YYOct],

dbo_MasterSalesForecast_Test.[YY:11]=[MasterSalesForecastUpdate].[YYNov])

,

IIF(Month(Date())="10",(SET

dbo_MasterSalesForecast_Test.[YY:10]=[MasterSalesForecastUpdate].[YYOct],

dbo_MasterSalesForecast_Test.[YY:11]=[MasterSalesForecastUpdate].[YYNov],

dbo_MasterSalesForecast_Test.[YY:12]=[MasterSalesForecastUpdate].[YYDec])

,

IIF(Month(Date())="11",(SET

dbo_MasterSalesForecast_Test.[YY:11]=[MasterSalesForecastUpdate].[YYNov],

dbo_MasterSalesForecast_Test.[YY:12]=[MasterSalesForecastUpdate].[YYDec],

dbo_MasterSalesForecast_Test.[YY+1:1]=[MasterSalesForecastUpdate].[YY+1Jan])

,

IIF(Month(Date())="12"(SET

dbo_MasterSalesForecast_Test.[YY:12]=[MasterSalesForecastUpdate].[YYDec],

dbo_MasterSalesForecast_Test.[YY+1:1]=[MasterSalesForecastUpdate].[YY+1Jan],

dbo_MasterSalesForecast_Test.[YY+1:02]=[MasterSalesForecastUpdate].[YY+1Feb])



)))))))))));

Answer 1

Cannot conditionally reference fields. Field must be static in query object then value to update with can be determined in an IIf() for each field. Use VBA to build and execute action SQL statement.

CurrentDb.Execute "UPDATE dbo_MasterSalesForecast_Test " & _
     "INNER JOIN MasterSalesForecastUpdate " & _
     "ON (dbo_MasterSalesForecast_Test.SubTo=MasterSalesForecastUpdate.Item) " & _
          "AND (dbo_MasterSalesForecast_Test.Planner=MasterSalesForecastUpdate.Planner) " & _
     "SET [YY:" & Month(Date()) & "] = [YY" & Format(Date(),"mmm") & "]," & _
         "[YY:" & Month(DateAdd("m",1,Date())) & "] = [YY" & Format(DateAdd("m",1,Date()),"mmm") & "]," & _
         "[YY:" & Month(DateAdd("m",2,Date())) & "] = [YY" & Format(DateAdd("m",2,Date()),"mmm") & "]"