sql - Update table A when row inserted in table B with multi select column -

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I have 2 tables like this: 

  Visitor Id | Name | Visit_from | From Image Visitor_log ID | Name | Visit_prom | From The requester   
 When I insert a record in  Visitor_log , the dates are updated in the table of viewers. When 1 visitor is requested I have to do this. The problem is that the  Visitor_log.Visitor  field is a multi-select field, so the code works only for one visitor:  
  subline_detailed (rsold, rsnew) ew_execute ("UPDATE [visitor] set [to visit] = (go to '' and & amp; rsnew (" & "); , [to] = ('& amp; amp; rsnew ("to") and "') where [visitor]. [visitor] name] = ('& amp; rsnew (" visitor ") and"'); " )   
 where the clause is created:  
  WHERE [visitor]. [Visitor] M] = (Visitor A)   
 But when multiple visitors are selected, it happens:  
  WHERE [visitor] [visitor] Name] = (Visitor A, Visitor B, Visitor C)   
 There is no Visitor  Visitor A, Visitor B, Visitor C  Therefore the SQL query fails in the form.  
 I have been stuck in a while. Now any help is greatly appreciated.  
 Update: I see it Query is set to what SQL is doing to  response.write  ...  
  sql: UPDATE [visitor] SET [visitors (name) ] = ('Mark M, Paul P') = ('10 / 10/2014 ') = ('10 / 10/2014') [Visitors] [Visitor]);    
 
 
 While reviewing your update, I think your problem is in quotes each Specific values ​​should be quoted and you should use these operators. Therefore, your query should look like this:  
  update [visitor] to go to SET [=] ('10 / 10/2014 '), [TO] = ('10 / 10 / 2014 ') where [visitor]. [Visitor (name)] ('Mark M', 'Paul P');   
 Assuming that rsnew ("visitor") is a string of values ​​different from coma and your language is vbscript, you can do something like  
  Ew_execute ("UPDATE [Visitor] SET [to visit] = ('go to & amp; rsnew (") & amp; "'), [TO] = ('& amp; rsnew (" to ") & amp; "') where [visitor] [visitor] name] IN (" "and (rsnew (" visitor "),", ","', '") and"'); "

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