意思：伪列；物理位置；返回行的物理地址
例句：
Duplicate Rows: Row ID uniqueness does not imply data uniqueness.RowID的唯一性并不说明了数据的唯一性。
ROWID pseudocolumn Rowids are used to quickly retrieve a row that was previously fetched based on its physical address.ROWID伪列Rowid用于快速获取之前根据其物理地址获取的行。
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UROWID and ROWID are read-only and so are unlikely to be synchronized.UROWID和ROWID是只读的，因此不可能进行同步。
