Fastest Way merge two SQLITE Databases

Question

I have 3 SQLite DBs, each having exactly the same set of 7 tables with respect to table structure. [They are Log Dumps from 3 different Machines].

I want to combine them

Answer 1

here is one way to merge two database with all tables of the same structure. I hope it could help.

import sqlite3
con3 = sqlite3.connect("combine.db")

con3.execute("ATTACH 'results_a.db' as dba")

con3.execute("BEGIN")
for row in con3.execute("SELECT * FROM dba.sqlite_master WHERE type='table'"):
    combine = "INSERT INTO "+ row[1] + " SELECT * FROM dba." + row[1]
    print(combine)
    con3.execute(combine)
con3.commit()
con3.execute("detach database dba")