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这个查询返回定时的表列数据，理解起来并不难。
This returns regular, tabular data and is not too complicated to understand.
youdao
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显然是在命名数据库表列的问题。
IndexOutOfRangeException: No column with the specified name was found.
youdao
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显然是在命名数据库表列的问题。
IndexOutOfRangeException: No column with the specified name was found.
youdao