《MicrosoftSQLServer2008MDXStepbyStep》学习笔记一：MDX查询第一课

SQL Server 2008中SQL应用系列及BI笔记系列--目录索引

导读:本文介绍MDX查询的基础内容，已经了解的读者可以直接略过。

本文将包括以下内容：

■1、使用MDX查询编辑器构建并执行MDX查询。

本文所用数据库和所有源码，请到微软官网下载

1、SQL查询与MDX查询示例比较

在MdxStepByStep数据库中（后缀名为.SQL）查询

USE MdxStepByStepSELECTm.EnglishProductName, o.TotalSalesAmountFROM dbo.DimProduct mINNER JOIN ( -- TOP 10 PRODUCTS OF 2003SELECT TOP 10a.ProductKey, SUM(a.SalesAmount) AS TotalSalesAmountFROM (SELECTx.productkey, x.salesamountFROM dbo.FactInternetSales xINNER JOIN dbo.DimDate yON x.OrderDateKey=y.DateKeyWHERE y.CalendarYear=2003UNION ALLSELECTx.productkey, x.salesamountFROM dbo.FactResellerSales xINNER JOIN dbo.DimDate yON x.OrderDateKey=y.DateKeyWHERE y.CalendarYear=2003) aGROUP BY a.ProductKeyORDER BY TotalSalesAmount DESC) nON m.ProductKey=n.ProductKeyLEFT OUTER JOIN ( --PRODUCT SALES IN 2004SELECTa.ProductKey, SUM(a.SalesAmount) AS TotalSalesAmountFROM (SELECTx.productkey, x.salesamountFROM dbo.FactInternetSales xINNER JOIN dbo.DimDate yON x.OrderDateKey=y.DateKeyWHERE y.CalendarYear=2004UNION ALLSELECTx.productkey, x.salesamountFROM dbo.FactResellerSales xINNER JOIN dbo.DimDate yON x.OrderDateKey=y.DateKeyWHERE y.CalendarYear=2004) aGROUP BY a.ProductKey) oON m.ProductKey=o.productkeyORDER BY n.TotalSalesAmount DESC/*EnglishProductName TotalSalesAmountMountain-200 Black, 38 1327957.4077Mountain-200 Black, 42 1139429.4872Mountain-200 Silver, 38 1136622.4928Mountain-200 Black, 46 1011074.3685Mountain-200 Black, 38 NULLMountain-200 Silver, 42 1011486.1762Touring-1000 Blue, 60 835290.1559Road-350-W Yellow, 48 897217.9635Mountain-200 Silver, 46 1029170.7639Road-350-W Yellow, 40 840970.6467*/

而在维度数据库中对应的MDX查询（后缀名为.MDX）如下：

WITHMEMBER [Measures].[Total Sales Amount] AS([Measures].[Internet Sales Amount]) + ([Measures].[Reseller Sales Amount])SET [Top 10 Products of 2003] ASTOPCOUNT({[Product].[Product].[Product].Members},10,([Measures].[Total Sales Amount], [Date].[Calendar Year].[CY 2003]))SELECT{([Measures].[Total Sales Amount])} ON COLUMNS,{[Top 10 Products of 2003]} ON ROWSFROM [Step-by-Step]WHERE ([Date].[Calendar Year].[CY 2004]);/*Total Sales AmountMountain-200 Black, 38 $1,327,957.41Mountain-200 Black, 42 $1,139,429.49Mountain-200 Silver, 38 $1,136,622.49Mountain-200 Black, 46 $1,011,074.37Mountain-200 Black, 38 (null)Mountain-200 Silver, 42 $1,011,486.18Touring-1000 Blue, 60 $835,290.16Road-350-W Yellow, 48 $897,217.96Mountain-200 Silver, 46 $1,029,170.76Road-350-W Yellow, 40 $840,970.65*/

从上面的这个例子我们领略了SQL与MDX语法的大致区别。

2、用MDX查询编辑器实现一个最简单的MDX的编写。

在SSMS界面登录Analysis Services，选择MDX Step By Step数据库：

对于MDX新手来说，最令人鼓舞的莫过于大部分MDX查询都可以借助拖拽来实现。

大家可以参考以下的MDX脚本完成本文开始提供的MDX查询。

WITHMEMBER [Measures].[Total Sales Amount] AS[Measures].[Internet Sales Amount]SELECTFROM [Step-by-Step]WHERE [Date].[Calendar Year].&[2004];WITHMEMBER [Measures].[Total Sales Amount] AS[Measures].[Internet Sales Amount]+[Measures].[Reseller Sales Amount]SELECTFROM [Step-by-Step]WHERE [Date].[Calendar Year].&[2004];WITHMEMBER [Measures].[Total Sales Amount] AS[Measures].[Internet Sales Amount]+[Measures].[Reseller Sales Amount]SET [Top 10 Products of 2003] ASTOPCOUNT( [Product].[Product],10)SELECTFROM [Step-by-Step]WHERE [Date].[Calendar Year].&[2004];WITHMEMBER [Measures].[Total Sales Amount] AS[Measures].[Internet Sales Amount]+[Measures].[Reseller Sales Amount]SET [Top 10 Products of 2003] ASTOPCOUNT( [Product].[Product].[Product].Members, 10,([Measures].[Total Sales Amount], [Date].[Calendar Year].[CY 2003]))SELECTFROM [Step-by-Step]WHERE [Date].[Calendar Year].&[2004];WITHMEMBER [Measures].[Total Sales Amount] AS[Measures].[Internet Sales Amount]+[Measures].[Reseller Sales Amount]SET [Top 10 Products of 2003] ASTOPCOUNT( [Product].[Product].[Product].Members, 10,([Measures].[Total Sales Amount], [Date].[Calendar Year].[CY 2003]))SELECT{([Measures].[Total Sales Amount])} ON COLUMNS,{[Top 10 Products of 2003]} ON ROWSFROM [Step-by-Step]WHERE [Date].[Calendar Year].&[2004];

参考资源：

1、MDX官方教程（http://msdn.microsoft.com/zh-cn/library/ms145506.aspx）

邀月注：鉴于读者提出意见，本系列尽量简明，方便读者阅读。