Question

Is it possible to achieve next thing without using views, but just one single query? I have two tables:

TableA->TanbleB (1-many) ON TableA.Id = TableB.TableAId

I need to update one field in Table A (TableA.Field1) for records in TableA that satisfy condition on one field in tableA (WHERE TableA.Field2=SomeValue)
.
TableA.Field1 will be updated from TableB with value that is last inserted (last inserted value in related records to TableA).

I will put an example:

UPDATE TableA a SET Field1 = (SELECT TOP 1 b.Feild1 * b.Field2 FROM TableB b WHERE b.TableAId = a.id) WHERE field2 = 1

I know Above example doesn’t work, but I have many ways tried using INNER JOIN and failed. I had an idea to use something like this:

UPDATE TableA INNDER JOIN ( SELECT ... FROM TABLE B) ON TABLEA.Id= TableB.TableAId SET ....

But the 2ns query should return 1 record for each DISTINCT TableAId, but only the last inserted.

I hope I am making some sense here.

Thanks in advance.

Answer 1

Here is some SQL that will do what you want

UPDATE T1 INNER JOIN T2 ON T1.ID = T2.T1ID SET T1.F2 = [T2].[F2]*[T2].[F3] WHERE (((T1.F1)="ABC") AND ((T2.ID)=DMax("[ID]","[T2]","[T1ID]=" & [T1].[ID])));

This predicated on T1.ID being the primary key for T1 and T2.T1ID being a index field in T2