Updateable Query ?

[jfp]

I want to have an Update Query where the data source is a Select Query
-- something like this:

UPDATE SomeTable INNER JOIN SomeQuery ON SomeTable.FieldA =
SomeQuery.FieldA
SET SomeTable.FieldB = SomeQuery.FieldA ;

When i try to run it, i get this error:
"Operation must use an updateable query"

WHY? I am NOT trying to update the query.

ALSO -- what is an "updateable query" ?

 

[Ken Snell]

In order to use a query to update a table's data, the query must be an
"updateable query". This term means that the query must be able to uniquely
identify each record in the tables so that it knows which record's value(s)
are to be changed.

The reasons for why a query may be nonupdateable are varied and sometimes
not obvious. See these links for more info (watch for word- and
line-wrapping; all URLs are one line):

"When can I update data from a query?"
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/off2000/htm
l/acconDeterminingWhenCanUpdateDataQueryS.asp


"Harnessing the Power of Updatable Queries"
http://msdn.microsoft.com/library/default.asp?url=/archive/en-us/dnaraccgen/
html/msdn_harness.asp