An example of a U.S. classified document; page 13 of a United States National Security Agency report on the USS Liberty incident, partially declassified and released to the public in July 2003. The original overall classification of the page, Top Secret code word UMBRA, is shown at top and bottom.
The Data Analysis Expressions (DAX) language is a formula language that allows users to define custom calculations in calculated columns and measures. DAX includes some of the functions that are used in Excel formulas, and additional functions that are designed to work with relational data and perform dynamic aggregation.
DAX Data Types. You can import data into a PowerPivot worksheet from many different data sources that might support different data types. When you import or load the data into a workbook and then use the data in calculations or in PivotTables, the data is converted to one of the PowerPivot data types.