同时操作(All-At-Once Operation) 摘要: SQL支持一种所谓的同时操作的概念，其含义是认为在同一逻辑查询处理阶段中出现的所有表达式都是同时进行计算的。
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It is best to select all of the model projects at the same time and to perform the share operation on all of them at once.
最好同时选择所有的模型项目，以对它们都执行share操作。
It is the set installation that the thrust bearing shed oil of hydrogenerator , Common problem in the operation, Yet still can not thoroughly cure once and for all at the moment.
水轮发电机推力轴承甩油是机组安装、运行中的常见问题，但目前还无法彻底根治。
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