How to prevent to insert duplicate value in sqlite database (if duplicate then overwrite)

Question

I had created two table in my database, In both table I am inserting value at the same time, now what I want to do is that, I want to insert record in second table, but the

Answer 1

While creating your table, put constraint on your column(Primary key or Unique key).This will not only the duplicate value to be inserted into your database.