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1·IN Step 9, select the ACCT and HOLDINGS tables.

在步骤9选择ACCT和holdings表。

2·Should the update to the ACCT table fail, there would be no mechanism to roll back the insert to the TRADE table, resulting in inconsistent data in the database.

若acct表更新失败，没有任何机制可以回滚到对trade表的更新操作，从而造成数据库中的数据不一致。

3·The account ID from this mapping operation can then be joined with the account ID included in the output of the Group By operation, creating a result set that will populate the target ACCT table.

然后，将该映射操作获得的账户ID与Group By操作的输出中包括的账户ID进行连接，创建一个结果集，该结果集将填充目标acct表。