使用邏輯函數
邏輯函數可對物件及運算式執行邏輯作業或比較，然後傳回布林值。多維度運算式 (MDX) 中必須要有邏輯函數，才能判斷成員的位置。
最常使用的邏輯函數是 IsEmpty 函數。如需有關如何使用 IsEmpty 函數的詳細資訊，請參閱＜使用空白值＞。
下列查詢會示範如何使用 IsLeaf 和 IsAncestor 函數：
WITH
//Returns true if the CurrentMember on Calendar is a leaf member, ie it has no children
MEMBER MEASURES.[IsLeafDemo] AS IsLeaf([Date].[Calendar].CurrentMember)
//Returns true if the CurrentMember on Calendar is an Ancestor of July 1st 2001
MEMBER MEASURES.[IsAncestorDemo] AS IsAncestor([Date].[Calendar].CurrentMember, [Date].[Calendar].[Date].&[1])
SELECT{MEASURES.[IsLeafDemo],MEASURES.[IsAncestorDemo] } ON 0,
[Date].[Calendar].MEMBERS ON 1
FROM [Adventure Works]