RANKX-Analysis Services 2012 Tabular

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RANKX was a new function made available in DAX at the launch of SQL Server 2012; however Ranking is a widely used function in most BI projects, and was very much anticipated. Having worked extensively with Tabular on a recent project we had the need to rank over large sets of data, with models based on billions of rows. Whilst we were extremely impressed with the performance of Tabular, we found something not quite right with RANKX. Suppose we had the following very simple format of data, and wanted to perform a simple Rank over it.

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