Question

I need to write a sql query that adds one column from one database (DB1) to another column and the sum is save in that column in the second database(DB2). where userIds are the same

DB1 TableA UserId People   DB2 TableB Amount UserId 

it would be something like this

DB2.TableB.Amount = DB2.TableB.Amount + DB1.TableA.People

Answer 1

Do you mean:

UPDATE b SET    Amount = b.Amount + a.People FROM DB2.dbo.TableB b INNER JOIN DB1.dbo.TableA a   ON  a.UserId = b.UserId 

dbo = owner of table, it can also be unspecified: DB1..TableA