Question 127
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Table 1: merchant
* ********* ***** *** *** ******* ******** **** ** * **********.
***_**** | ***_**** -----------------+------------------- ** | ****** ***********_*** | ***** *****_****** | *******(5) ********_****_** | ****** **_****** | ******* *****_******_** | ********* **** | **** ******* | *******(2)
Table 2: trip
**** ***** *** ***** **** **** ********.
***_**** | ***_**** --------------------+------------------- ****_** | ****** **** | **** ****_*****_** | ********* ********_***_*** | *** *****_***_*** | *** **_********_******* | ******* **_********* | ******* **_****_**** | ******* ****_** | ****** **********_** | ****** *******_** | ****** **** | **** ******* | *******(2)
Table 3: trip_rating
******* ******** ***** * **** *** ********, ****** ***** ** ** ***** ****.
***_**** | ***_**** --------------------+------------------- ****_** | ****** ********_** | ****** ******* | **** *****_** | *******
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