SQL AUTO INCREMENT 字段

参考链接：

1.https://www.runoob.com/sql/sql-autoincrement.html
2.https://www.cnblogs.com/CandiceW/p/10062413.html
3.https://www.cnblogs.com/kkxwze/p/10852997.html
4.https://dba.stackexchange.com/questions/61603/how-to-query-and-increase-a-value-counter-in-a-thread-safe-way-avoid-race-co