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Inner join and update statement in Access

Posted on 2009-05-11
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Last Modified: 2012-05-06

I saw below SQL statement in an Access project:
  db.Execute "UPDATE tableA INNER JOIN tableB" _
               & "ON tableA.NUMBER = tableB.Number_ASC" _
               & "Set tableA.field1 = tableB.field1
            ...

I don't have much experience in Access, could anyone explain this query? Is it a common practice in Access? BTW, I know inner join, but am just not used to the usage of the update statement here. Thanks.

 
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Question by:heyday2004
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Guy Hengel [angelIII / a3] earned 400 total points
ID: 24352281
that UPDATE does a update of tableA, if there are matching rows in tableB, based on the join, and assigns the value of field1 of tableb for the matching row to tableA.field1.

and yes, this is common practice in access.
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Assisted Solution

by:GRayL
GRayL earned 100 total points
ID: 24354953
It will only be an updatable query if the fields in the ON clause are primary keys (no duplicates).  If there was ever an instance where there were two or more records from tableB matching the tableA join, the update would fail.
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