Incorrect syntax near '.'. While Update a variable table

Question

I have an issue while updating a table variable. I've already declared it, however when I run the whole query I get this error:

Incorrect syntax near '.'.

And I can't seem to solve the issue...

UPDATE @List 
SET nrID = CASE 
              WHEN nrID IS NULL 
                 THEN t1.nrID 
                 ELSE nrID 
           END 
FROM @List 
INNER JOIN table1 t1 ON @List.PNr = t1.PNr
INNER JOIN table2 t2 ON t1.n nrPNr = t2.nrPNr
WHERE t1.PNr = t2.PNr AND t2.Isactive = 0

Answer 1

UPDATE List 
SET List.nrID = t1.nrID
FROM @List AS List
INNER JOIN table1 t1 ON List.nrID = t1.nrID
INNER JOIN table2 t2 ON t1.nrID = t2.nrID
WHERE t1.nrID = t2.nrID AND t2.Isactive = 0

As mentioned in the comments the inner join will remove any nulls in your case

Answer 2

Thanks for the help, changed my declared @table to create @temptable and it took away my incorrect syntax error.

As for the query I Used (example);

UPDATE Person
   SET Car = ISNULL(@Car, Car),
       HairColour = ISNULL(@HairColour, HairColour),

Answer 3

Try this,

UPDATE L
SET L.nrID = ISNULL(t1.nrID, t2.nrID)
FROM @List L
INNER JOIN table1 t1 ON L.PNr = t1.PNr
INNER JOIN table2 t2 ON t1.nrPNr = t2.nrPNr
WHERE t1.PNr = t2.PNr
    AND t2.Isactive = 0