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DSum syntax with two form criteria

Posted on 2014-02-17
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I have a syntax issue with the folloing code using two criteria.  Can someone spot the problem?

Me.txtAvailQty = DSum("[IncomingQty]", "tblInventoryDetails", -"[SoldQty]", "tblInventoryDetails", "[ProductID] = " & [Forms]![frmInventory]![txtProdID], "[LocationID] " & [Forms]![frmInventory]![txtToID])
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Question by:SteveL13
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by:PatHartman
ID: 39864844
Me.txtAvailQty = DSum("[IncomingQty]", "tblInventoryDetails",  "tblInventoryDetails", "[ProductID] = " & [Forms]![frmInventory]![txtProdID] & " AND [LocationID] = " & [Forms]![frmInventory]![txtToID])

Sometimes it is easier to understand SQL Strings if you build them as a variable so you can see the results of your effort.

Dim strWhere As String
strWhere =   "[ProductID] = " & [Forms]![frmInventory]![txtProdID] & " AND [LocationID] = " & [Forms]![frmInventory]![txtToID])

Me.txtAvailQty = DSum("[IncomingQty]", "tblInventoryDetails", "tblInventoryDetails", strWhere)

PS -- I removed ---- -"[SoldQty] ", --- because I couldn't figure out what it went to.  It isn't the table/query name and didn't have any variable to compare to so it didn't look like it should be part of the where clause.
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by:SteveL13
ID: 39864949
I have to have SoldQty because AvailQty - Sum of IncomingQty minus Sum of SoldQty
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PatHartman earned 500 total points
ID: 39865126
You can only get a single column from a domain function.

Is SoldQty in the same table as IncomingQty?  

There are two possible solutions and I don't know which will give you the answer you need.  Probably the second one since I suspect that each transaction would be in a separate record.

Me.txtAvailQty = DSum("[IncomingQty] - [SoldQty]", "tblInventoryDetails", "tblInventoryDetails", strWhere)

OR

Me.txtAvailQty = DSum("[IncomingQty]", "tblInventoryDetails", "tblInventoryDetails", strWhere) - DSum("[SoldQty]", "tblInventoryDetails", "tblInventoryDetails", strWhere)
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Author Comment

by:SteveL13
ID: 39865364
This worked...

Me.txtAvailQty = DSum("[IncomingQty]", "tblInventoryDetails", "tblInventoryDetails", strWhere) - DSum("[SoldQty]", "tblInventoryDetails", "tblInventoryDetails", strWhere)

but I had to remove the double "tblInventoryDetails" in 2 place.   Thanks.

--Steve
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Expert Comment

by:PatHartman
ID: 39865685
I just washed my hands and can't do a thing with them.  Glad you worked it out.
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Author Comment

by:SteveL13
ID: 39865873
But your solution worked.  I just spotted the double "tblInventoryDetails".  At least I know how to do that.  Thanks again.  I appreciate your efforts.
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