mysql - oracle的数据表的ROWID

Question

Oracle的数据表有一个重要的字段ROWID，这个字段有什么用？

其他的数据库有没有这个字段，据我了解MySQL是没有的

Answer 1

rowid is the unique identifier of each record. It can be simply and roughly understood as a hidden unique key, which is used for index positioning and management queries, just like a house number address. MySQL also has it, called _rowid, which is available in almost any relational database.