Selecting from an external table reads the data from the data file(s) and provides it in the form of rows and columns as if it was read from the normal base table.

从外部表选择可从一个或多个数据文件读取数据，并以行和列的形式提供该数据，就好像从常规基表读取数据一样。

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As the data for the base table (s) changes, the MQT needs to be updated accordingly.

当基本表中的数据发生改变时，需要相应地更新MQT。

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The s lock allows concurrent applications that use read-only queries to access the target table, but applications attempting to write data to the table are prevented from doing so.

s锁允许使用只读查询的并发应用程序访问目标表，但是防止应用程序写数据到表中。

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If you look at the table below based on data from Eakle's decades-long Stock Market Diary, you will see that Monday probably represented a dramatic purge and capitulation such as we haven't seen since 1987 or 1990, when the percentage of stocks above their 200-day moving averages also fell to single digits.

FORBES: Magazine Article

Risk aversion is back on the table after U.S. equity markets have been nose diving for the last couple of weeks, data shows a general slowing of the global economic recovery, and QE2 comes to an end.

FORBES: S&P 500's Overreaction To Risk Aversion Won't Boost The Dollar