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

This is working for me,and i also created Category as a primary key..

ContentValues Val = new ContentValues();
Val.put("IDD", idd); 
Val.put("Category", cat);
long rows=db.insertWithOnConflict(TABLE_CATEGER, null,  Val,SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("kkkkkkkkkk",""+ rows);
db.close();
return rows; // return rows inserted.