data item

基本解釋

Although the Product line has been replaced with the Product type query item, the summary filter is still in place and scoped on a now non-projected data item “Product line”.
盡管 Product line 現(xiàn)在已經(jīng)替換為 Product type 查詢(xún)項(xiàng)目，但摘要過(guò)濾器仍然就位，并以一個(gè)現(xiàn)在沒(méi)有投射的數(shù)據(jù)項(xiàng)目 “Product line” 為范圍。
By using the for clause in the after-aggregation detail filter on a non-projected data item, the underlying query automatically projects and groups the item as the outer most column of the list.
通過(guò)在一個(gè)未投射的數(shù)據(jù)項(xiàng)上的 after-aggregation 細(xì)節(jié)過(guò)濾器中使用 for 子句，底層查詢(xún)會(huì)自動(dòng)將該項(xiàng)目投射并分組為列表的最外層列。
We must distinguish between a record type and a instance of the data-item types and record types stored in a database the term subschema refers to an collocation programmer's vies of the data he uses.
如果數(shù)據(jù)庫(kù)的作用僅僅是存貯數(shù)據(jù)，那它的結(jié)構(gòu)將是簡(jiǎn)單的，大多數(shù)復(fù)雜性起因于數(shù)據(jù)必須所表現(xiàn)所存貯各種各樣的數(shù)據(jù)項(xiàng)之間的關(guān)系。

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數(shù)據(jù)項(xiàng)
The destination of classification is to learn a classification function or classification model that can map a data item to a preassigned class.
分類(lèi)的目的是學(xué)會(huì)一個(gè)分類(lèi)函數(shù)或分類(lèi)模型，該模型能把數(shù)據(jù)庫(kù)中的數(shù)據(jù)項(xiàng)映射到給定類(lèi)別中的某一個(gè)。
數(shù)值項(xiàng)
資料項(xiàng)