Update with Subquery in MS ACCESS - sql

Question

I'm trying to make this query work but I'm getting errors:
UPDATE SIRADATOK T1 INNER JOIN (SELECT sirid, MAX(SzolgaltatasokDatumig) AS MAXDATE
FROM ADOK GROUP BY SIRID HAVING MAX(SzolgaltatasokDatumig)<>' ' AND
MAX(SzolgaltatasokDatumig) IS NOT NULL) AS T2 ON T1.SIRID=T2.sirid
SET MegvaltasIdeje = MAXDATE;
The error I get:
"Operation must use updatable query"
I tried this way too:
UPDATE T2
SET T1.MegvaltasIdeje = T2.MAXDATE
FROM SIRADATOK T1, (SELECT sirid, MAX(SzolgaltatasokDatumig) AS MAXDATE
FROM ADOK GROUP BY SIRID HAVING MAX(SzolgaltatasokDatumig)<>' '
AND MAX(SzolgaltatasokDatumig) IS NOT NULL) T2
WHERE T1.SIRID=T2.sirid
but I get:
"Syntax error (missing operator) in query expression 'T2.MAXDATE FROM SIRADATOK T1'."

Answer 1

using June7 comment, I created the following query that it works:
UPDATE
SIRADATOK AS T1
SET
T1.MegvaltasIdeje = MID(
DMAX(
"SzolgaltatasokDatumig", "Adok",
"SzolgaltatasokDatumig<>' '
AND SzolgaltatasokDatumig IS NOT NULL AND SIRID=" & T1.SIRID
),
1,
10
)
WHERE
DMAX(
"SzolgaltatasokDatumig", "Adok",
"SzolgaltatasokDatumig<>' '
AND SzolgaltatasokDatumig IS NOT NULL AND SIRID=" & T1.SIRID
) Is Not Null
And DMAX(
"SzolgaltatasokDatumig", "Adok",
"SzolgaltatasokDatumig<>' '
AND SzolgaltatasokDatumig IS NOT NULL AND SIRID=" & T1.SIRID
)<> ' '
I added an extra MID for the SzolgaltatasokDatumig column, because the column is a DateTime and I need just the Date
I know that is not the best optimized query, but this is just for a one-time use and It works.
thanks again,
June7