[Konstantinos]

Change to:

pawn Код:

format(Query, sizeof(Query), "UPDATE HOUSES SET NAME = 'Grad', FOR_SELL = 1, SELL_PRICE = %d, RENTPRICE = 1000, HOUSE_LEVEL = %d, X = %f, Y = %f, Z = %f, VIRTUALWORLD = &d, STATUS = 0 WHERE ID = %d", sellprice, HouseLvl, X, Y, Z, ID, ID);
db_query(Database, Query);
print(Query); // DEBUG!

Also make sure the names of the fields are correct. If it's "SELLPRICE" instead of "SELL_PRICE" (en example) will fail to update.