问题
I would like to include an integer version field in my table, auto-incrementing on each update made to a row. Is it possible to do this in MySQL?
Please note that I'm not talking about a TIMESTAMP, which is not reliable as two concurrent updates might happen during the same second.
回答1:
The only way (I can think of) to do this is a (before-update) trigger that automatically increments the column value.
回答2:
Yes it is. The more general problem is called slowly changing dimensions.
来源：https://stackoverflow.com/questions/6290695/row-versioning-in-mysql