Why is the waiter in the restaurant called the bartender and the waiter in the teahouse called Dr. Tea?

The origin of the title of "shop assistant"

"Shop assistant" refers to the waiters in ancient restaurants and hotels, so why are they called "shop assistants"?

In the old society, ordinary people living at the bottom of society generally had no names. Only when you go to school can you have a scientific name, and once you become an official, you will have an official name. However, only a few ordinary people can go to school or be officials, and most people don't have this opportunity. So their names are mostly called by generations or the age of their parents. For example, Chang Yuchun's great-grandfather was called May 4th Movement, his second brother was called Liu Chong, his third brother was called Chongqi, and he himself was called Chongba. The waiters in ancient hotels or inns were obviously ordinary people, so people should also give them a digital symbol to address them. The boss in charge is of course the "shop owner", and these waiters are also called "shop assistants" accordingly.

The ancients called Lu Yu "Dr. Tea" because Lu Yu had a book "Tea Classic" handed down from generation to generation, and was addressed as "Dr. Tea" by Emperor Tang Dezong. Later, the guy who sold tea was called Dr. Tea. The wine peddler is a doctor of wine, and the grinder is a doctor of grinding. In the Song Dynasty, most teahouses implemented the employment system, and people called the people who were familiar with tea-making skills hired by tea shop owners "Dr. Tea". Some people humorously divide the guys in the teahouse into "Doctor Tea" and "Bachelor Tea" according to their technical level: Doctor Tea can put a stack of covered bowls on his arm, hold a pot of boiling water by himself, and aim at the tea bowl three times without leaking, which is called "Phoenix Three Nods". It seems that Dr. Tea, who has only nodded, can only be relegated to the "Bachelor of Tea". Huang Province in the Ming Dynasty once wrote in Wu: Up to now, anyone who calls vertebral oil noodles is a doctor.