# Prevailing quote at the time of a trade

```ipython3
import onetick.py as otp

trd = otp.DataSource('US_COMP_SAMPLE', tick_type='TRD')
trd = trd[['PRICE', 'SIZE']]

qte = otp.DataSource('US_COMP_SAMPLE',
                     tick_type='NBBO',
                     back_to_first_tick=otp.Minute(10))

qte = qte[['ASK_PRICE', 'BID_PRICE']]
qte['quote_time'] = qte['Time']

enriched_trades = otp.join_by_time([trd, qte])

otp.run(enriched_trades,
        symbols=['AAPL'],
        start=otp.dt(2024, 2, 1, 9, 30),
        end=otp.dt(2024, 2, 1, 9, 30, 1),
        timezone='EST5EDT')
```

```myst-ansi
                             Time    PRICE  SIZE  ASK_PRICE  BID_PRICE                    quote_time
0   2024-02-01 09:30:00.000961260  184.010   302     184.14     184.00 2024-02-01 09:30:00.000860953
1   2024-02-01 09:30:00.000961491  184.000   100     184.14     184.00 2024-02-01 09:30:00.000860953
2   2024-02-01 09:30:00.000961701  184.000     1     184.14     184.00 2024-02-01 09:30:00.000860953
3   2024-02-01 09:30:00.000973163  184.000     1     184.14     183.90 2024-02-01 09:30:00.000969529
4   2024-02-01 09:30:00.000973355  184.000     5     184.14     183.90 2024-02-01 09:30:00.000969529
..                            ...      ...   ...        ...        ...                           ...
574 2024-02-01 09:30:00.987184691  183.900     9     183.93     183.89 2024-02-01 09:30:00.973387417
575 2024-02-01 09:30:00.990378350  183.920     1     183.93     183.89 2024-02-01 09:30:00.987461418
576 2024-02-01 09:30:00.991941892  183.935     1     183.93     183.89 2024-02-01 09:30:00.987461418
577 2024-02-01 09:30:00.993785116  183.905   300     183.93     183.89 2024-02-01 09:30:00.987461418
578 2024-02-01 09:30:00.996512511  183.934     5     183.93     183.89 2024-02-01 09:30:00.987461418

[579 rows x 6 columns]
```