使用筛选器(例如sql子句)筛选掉不属于当前租户的数据记录。
A filter (e.g., SQL statement sub-clause) is used to filter out data records not belonging to the current tenant.
如果该子句未指定任何内容，那么可以提取来自实例中任何数据库的审计记录。
If you do not specify anything for this clause, audit records from all databases in the instance are eligible for extraction.
事情还没有完结，如果数据提供者是一个SQL数据库的话，WHERE子句必须应用在每条记录上。
But we're not done yet. If the data provider is an SQL database, the WHERE clause must be applied to each record.
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