import sqlite3
import shutil
import argparse
def merge_tables_from_second_to_first(db1_path, db2_path, merged_db_path, table_names):
    # 复制主数据库以生成合并后的副本
    shutil.copyfile(db1_path, merged_db_path)
    # 连接到第二个数据库
    conn2 = sqlite3.connect(db2_path)
    cursor2 = conn2.cursor()
    # 连接到合并后的数据库
    conn_merged = sqlite3.connect(merged_db_path)
    cursor_merged = conn_merged.cursor()
    for table_name in table_names:
        # 从第二个数据库中获取指定表的数据
        cursor2.execute(f"SELECT * FROM {table_name}")
        data2 = cursor2.fetchall()
        column_names2 = [description[0] for description in cursor2.description]
        # 如果表在合并后的数据库中不存在，则创建
        cursor_merged.execute(f"CREATE TABLE IF NOT EXISTS {table_name} ({', '.join(column_names2)})")
        # 插入数据到合并后的数据库中
        insert_query = f"INSERT INTO {table_name} ({', '.join(column_names2)}) VALUES ({', '.join(['?' for _ in column_names2])})"
        cursor_merged.executemany(insert_query, data2)
    # 提交更改并关闭连接
    conn_merged.commit()
    conn2.close()
    conn_merged.close()
def main():
    parser = argparse.ArgumentParser(description="合并两个 SQLite 数据库中的特定表")
    parser.add_argument("db1_path", help="主数据库文件路径")
    parser.add_argument("db2_path", help="要合并的数据库文件路径")
    parser.add_argument("merged_db_path", help="合并后的数据库文件路径")
    parser.add_argument("table_names", nargs='+', help="需要合并的表名列表(两个库中的表名及表结构必须一致)")
    args = parser.parse_args()
    merge_tables_from_second_to_first(args.db1_path, args.db2_path, args.merged_db_path, args.table_names)
if __name__ == "__main__":
    main()
命令行调用
 
python merge_dbs.py D:\v1\mydb.db D:\v1\mydb.db D:\v1\merged.db 表1 表2
				
参考：https://blog.csdn.net/zhanglianyu00/article/details/78436764
sqlite3 test2.sqlite 
attach "test1.sqlite" as AM;
insert into tiles(zoom_level,tile_column,tile_row,tile_data) select zoom_level,tile_column,tile_row,tile_data from AM.tiles;
				
假设表table1存在test1.db，表table2存在test2.db，现需要将table2迁移至test1.db中。
1、在test1.db中，从File—>Attach Database进去，选择test2.db文件，将test2.db中所有的表添加进test1.db中，如下图1所示；
2、执行语句
create table table2 as select * from t...
attach DataBase 'F:\Sqlitedatabase.db' as db2;
delete from Test where Test.ID in (select ID from db2.Test);
insert into Test select A.* from db2.Test as A ;
select * from db2.Test;
detach database