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嵌套select

嵌套select

嵌套select

嵌套select

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It's very common to have many nested functions in a SELECT statement .

SELECT 语句中存在嵌套函数是非常普遍的。

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This is a bit tricky : If there are nested com. ibm directories, select the innermost directory, as shown in Figure 10 .

这稍微有些复杂：若 com.ibm 目录嵌套，那么请选择最内层的目录，如图 10 中所示。

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Alternatively, you can drag EmitCustomerWrapperInput onto the canvas and use the menu to select the nested business objects and attributes .

另外，您也可以将 EmitCustomerWrapperInput 拖到画布上，然后使用菜单选择嵌套的业务对象和属性。

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Specifies the provider supports nested SELECT statements in the FROM clause .

指定提供程序支持在 FROM 子句中包含嵌套 SELECT 语句。

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Select Case constructions can be nested .

构造可相互嵌套。

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Select the table that represents the nested child element and drag and drop it onto the table that represents the parent element .

选择代表嵌套子元素的表，并将它拖放到代表父元素的表上。

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The second nested SELECT retrieves product names for products in the product model .

第二个嵌套 SELECT 语句检索该产品型号中的产品的产品名。

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Select the key of the nested table in Source Columns .

在 “源列 ”中选择嵌套表的键。

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The order of nesting for the elements is based on the order of the tables in the select-list .

元素的嵌套顺序基于选择列表中表的顺序而定。

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The results returned by this subselect statement are pivoted on the EmployeeID column .

将在 EmployeeID 列上透视此嵌套 select 语句返回的结果。

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The order of nesting is based on the order in which tables are referenced in the select list .

嵌套的顺序基于选择列表中引用表的顺序而定。

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The nested SELECT retrieves a list of product IDs.

嵌套 SELECT 语句将检索产品 ID 列表。

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To ensure that only 10 rows are deleted , the column specified in the subselect statement (PurchaseOrderID) is the primary key of the table .

为了确保仅删除 10 行，嵌套 Select 语句（PurchaseOrderID ）中指定的列将成为表的主键。

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Enable grouping by a column that is derived from a scalar subselect , or a function that is either not deterministic or has external access .

启用按从标量嵌套 select 语句派生的列进行分组，或者按不确定性函数或有外部访问的函数进行分组。

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