Another query against the summary table returns no data as well.
再次查询总结表，仍然没有返回任何数据。
Not unexpectedly, a query against the summary table at this point returns no data.
不出所料，此时对总结表的查询没有返回任何数据。
Another query against the summary table returns no data, but after the REFRESH table statement executes this time, the query runs successfully.
再次查询总结表，又是没有返回数据，但是当执行了REFRESHtable语句之后，查询得以成功运行。
Most of the time, polling returns no data, or worse, data we've already seen and have to process again or identify as having already been processed.
在大多数时候，轮询不返回数据，更糟的是，会返回我们已经见过的数据，但又必须再次处理或标识为已经处理过。
Most of the time, polling returns no data, or worse, data we've already seen and have to process again or identify as having already been processed.
在大多数时候，轮询不返回数据，更糟的是，会返回我们已经见过的数据，但又必须再次处理或标识为已经处理过。
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