Android : Merge Two Sqlite database in to single

I have two Databases.

I have Existing database 'Mydb.db' & 'Updatedb.db' file

both the database have structure and so both have same table let say "TAble1".

i want to update all the records which is in 'Updatedb.db' file in 'Table1'.

there are bulk data around min 25,000 records required to update.

i required to do this pragmatically.