Question

I have a group of databases which have a table with same schema. So, i am doing a UNION on this table to show the records from all databases, which works nice.

But, now i have to detect which row belongs to which database/table, as i need to modify that particular record. I found this link on getting the UNION, but am unable to find the logic which determines row<->table relationship.

Answer 1

try this:

(SELECT *, 'db1' as DB_NAME from db1..table1)
union
(SELECT *, 'db2' as DB_NAME from db2..table1)
union
(SELECT *, 'db3' as DB_NAME from db3..table1)
...