What should I do with SQLAlchemy NameError: Name ‘db’ is not defined

app = Flask(__name__)
db = SQLAlchemy(app)

db = SQLAlchemy()

def create_app():
*/
* Your code 
/*
db = SQLAlchemy(app)
db.init_app(app) # HERE you need to call an init_app

return app

db.init_app(app)