Question

I have two SQL Server databases A and B

They both contain a table named Users with the columns name, Age, Salary

I want to write a script to insert the Users from database A into database B (if they don’t already exist based on Name)

So basically I need this in SQL script:

Foreach (UserA in DatabaseA.Users)
    If UserA.Name does not exist in DatabaseB.Users
        Insert UserA in DatabaseB.Users

Thanks a lot for any help

Answer 1

one way, no need to loop, you can do it set based

insert DatabaseB.Users
select name, age,salary
from DatabaseA.Users a
where not exists (select 1 from DatabaseB.Users b where b.name = a.name)

There are more ways to do this by using IN, OUTER JOIN, EXCEPT, some examples here Select all rows from one table that don’t exist in another table