This chapter discusses the basic concepts of length and inner product in the vector spaces R n. It describes the properties of vector spaces that are based on an inner product. It is possible to define an inner product for vector spaces over fields other than the field R of real numbers ...
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The inner decoder may be a soft-decision decoder that provides bit error probabilities, or a sum-product decoder that provides bit error information. Thus, unlike conventional outer decoders, the outer decoder does not require a conventional first stage for determining errors in the output bit ...
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left join,(或left outer join:在Mysql中两者等价,推荐使用left join.)左连接从左表(A)产生一套完整的记录,与匹配的记录(右表(B)) .如果没有匹配,右侧将包含null。 如果想只从左表(A)中产生一套记录,但不包含右表(B)的记录,可以通过设置where语句来执行,如下: ...
只能基于同一源表中的列(具有相同的世系)进行联接。 例如,对于 Products[ProductID]、WebSales[ProductdID] 和 StoreSales[ProductdID],WebSales 和 StoreSales 表与 Products 表之间存在基于 ProductID 列的多对一关系,因而 WebSales 和 StoreSales 表基于 [ProductID] 进行联接。
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