Update target table column value when source table column value is different

skull52
skull52 used Ask the Experts™
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I have an access table tbl_Items_UPC (Target Table) with a QTYONHND column that I want to only update from dbo_SSG_UPC_SCAN (Source Table) when the source value changes. I work mostly with SQL and it has a MERGE function that does that very well. I suspect that I would have to use an update query in access to accomplish this, I have tried a couple of queries but it didn't seem to work. I am using Access 2016
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Senior Application Developer
Commented:
Sounds like you need a select query that joins tbl_Items_UPC to dbo_SSG_UPC_SCAN on the key field(s) and has a criteria in the dbo_SSG_UPC_SCAN.QTYONHND column  <> tbl_Items_UPC.QTYONHND .  That should return the rows in dbo_SSG_UPC_SCAN that have QTYONHND  values different from those in tbl_Items_UPC.  Then make it an update query and set the tbl_Items_UPC.QTYONHND update cell to dbo_SSG_UPC_SCAN.QTYONHND.
Hamed NasrRetired IT Professional

Commented:
Agree with Paul's comment.
Here is an application to table a(aid, f) as source, and table b(aid, f1) as target.
Need to update f1 in target when f1 is different.
UPDATE b AS target INNER JOIN a AS source ON target.aid = source.aid SET target.f1 = source.f1
WHERE (((target.f1)<>[source].[f1]));

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skull52IT director

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Commented:
Thanks Paul, I should have figured that out, that is how I would have done in in SQL if I didn't use  SQL's MERGE Function

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