一个参数标记或一个主变量。
您还研究了参数标记/主变量的使用会为 DB2 优化器对分布统计信息的考虑带来怎样的限制。
You have also examined how the use of parameter markers/host variables may limit the consideration of distribution statistics by the DB2 optimizer.
此时，应用程序被更新为允许博主在删除评论时将一个用户或域标记为“恶意用户”。
At this point, the application is updated to allow the blogger, when deleting a comment, to flag a user or domain as a spammer.
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