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In some case, we found that when we execute the sql commands like truncate table, drop table, delete all records in table, join 2 tables, it will take 阅读全文
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If a table have column A and B Count(distinct A) as Da Count(distinct B) as Db Count(distinct A, B) as Dab The Da/Db<=Dab, this will be always true; 1 阅读全文
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If you don't have the permission to generate script according to an existing db, but you have the read permission for that db, if so you can use selec 阅读全文
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When would I use Task.Yield()? http://stackoverflow.com/questions/22645024/when-would-i-use-task-yield In order to have a better understanding for abo 阅读全文