SQL Server 2008 Merge Statement Multiple Match Conditions -


i attempting bring in claim data in incremental manner. matching source , target on system (varchar) , claimnum (varchar), hash of other columns check changes.

i have merge statement (simplified):

merge target using source on target.system = source.system              , target.claimnum = source.claimnum  when matched , target.hashvalue <> source.hashvalue {update claim record data}  when matched , target.hashvalue = source.hashvalue {update claim record "checked"}  when not matched {insert new claim record}

however, can't have 2 matched conditions. how else can accomplish merge statement?

this being used on sql server 2008.

you use case or iif(sql server 2012) add custom logic:

merge target using source   on target.system = source.system  , target.claimnum = source.claimnum when matched     update set column_name =              case when target.hashvalue = source.hashvalue ...                  else ...             end when not matched {insert new claim record}

edit:

if update use multiple conditions/set same value skip:

... update set column_name1 =              case when condition1 ...                  else column_name1             end            ,column_name2 =               case when condition1 ...                   when condition2 ...                   else column_name2              end            ,...

note:

if source/target hashvalue nullable should handle using coalesce/isnull/adding or target.hashvalue null.... comparison operators don't work null.


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