注意：当一个或多个复制定义引用被删除的列时，Enterprise Replication不允许从一个复制表中删除一列。
Note: Enterprise Replication does not allow dropping a column from a replicated table when one or more replicate definitions refer to the column being dropped.
在sdiff形式中，源的老版本和旧版本都各在一边显示出来，同时显示的还有两边之间的一列，它能指示是否添加、删除或者更改了行。
In sdiff style, the old and new versions of the source are displayed side-by-side, with a column between them indicating whether the lines were added, deleted, or changed.
客户想删除除时间维(表是在这一列上进行数据分区的)以外的其他维上的大量数据。
A customer wants to delete large amounts of data on other dimensions than time (which is the column that the table is data partitioned on).
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