ACCESS update with subquery

问题

I have a table like this:

Now I'm trying to write in the column "SUMAMOUNT" of the table the sum of amount per "CODE" and "IBAN" but i can't reach this.

I'd want something like this:

I'm using this query but it doesn't work:

update tabella
set sumamount = (select sum(t2.amount)
                  from tabella as t2
                  where t2.code = tabella.code and t2.iban = tabella.iban
                 );

The precedent query gives me this result:




Can you help me? I'm using MS ACCESS. Thank you in advance!

EDIT: Screenshot of the error:

I can't even try to run it because he ask me to save it. When I try to save, access gives me this error.

回答1:

Consider domain aggregate, DSum, which allows an updateable query. Below assumes code and iban are text types and therefore requires single quote enclosures.

UPDATE tabella t
SET t.sumamount = DSUM("amount", 
                       "tabella",  
                       "code = '" & t.code & "' AND iban = '" & t.iban & '");

(By the way, best practice in databases is to avoid saving calculations in tables. Save resources and simply run queries on data as needed.)

来源：https://stackoverflow.com/questions/62988053/access-update-with-subquery