I have two databases, both databases has a table with a column of common values. What I am trying to achieve is to get all records, where database1 table1(with common values) record do not have counterpart in database2 table2(with common values).
Which is the best method to get these records? Is there any resource light way to do that, where database performance is not affected?

For example:

```
Database1
Table1 - id/number(common value)/object/name

Database2
Table1 - table_id/number(common value)/table_object/table_name

```

lets say that database1 table1 column "number" has values: 1,2,3 and database2 table1 column "number" has values 1,2,3,4,5
Now I need to find these two records, what are missing in database1, but what are excisting in database2( in this example, I am looking records where "number" value in database2 are 4 and 5)