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燕然未勒：指战事未平，功名未立。燕然：即燕然山，今名杭爱山，在今蒙古国境内。 据《后汉书·窦宪传》记载，东汉窦宪率兵追击匈奴单于，去塞三千余里，登燕然山，刻石勒功而还。 会意字：义，孬 李代桃僵，成语，李树代替桃树而死，原比喻兄弟互相爱护互相帮助，后转用来比喻以此代彼或代人受过 孺人，古时称大夫的妻 阅读全文
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https://docs.microsoft.com/en-us/sql/ssms/visual-db-tools/create-self-joins-manually-visual-database-tools https://www.tutorialspoint.com/sql/sql-self 阅读全文
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https://docs.microsoft.com/en-us/sql/t-sql/queries/select-over-clause-transact-sql Determines the partitioning and ordering of a rowset before the ass 阅读全文
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You'll use SQL Source Control differently depending on which development model you're using: 不同的模式有不同的使用方式 The dedicated model In the dedicated model, 阅读全文
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https://docs.microsoft.com/en-us/sql/t-sql/language-elements/raiserror-transact-sql Generates an error message and initiates error processing for the 阅读全文
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https://docs.microsoft.com/en-us/sql/t-sql/language-elements/case-transact-sql Evaluates a list of conditions and returns one of multiple possible res 阅读全文