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The important thing to remember is that, in Power Pivot, a blank value, an empty cell, or a missing value are all represented by the same new value type, a BLANK.How blanks are handled in operations, such as addition or concatenation, depends on the individual function.
This data type is used by DAX in many functions, such as aggregations and time intelligence calculations.You can use the formatting options in the worksheet to control the way that the value is displayed.Real numbers are numbers that can have decimal places.Some functions require a reference to a table; other functions return a table that can then be used as input to other functions.In some functions that require a table as input, you can specify an expression that evaluates to a table; for some functions, a reference to a base table is required.For information about the requirements of specific functions, see Each DAX function has specific requirements as to the types of data that are used as inputs and outputs.
For example, some functions require integers for some arguments and dates for others; other functions require text or tables.
When you import data or use a value in a formula, even if the original data source contains a different data type, the data is converted to one of the following data types.
Values that result from formulas also use these data types.
In general, these data types are implemented to enable accurate calculations in calculated columns, and for consistency the same restrictions apply to the rest of the data in Power Pivot.
Formats used for numbers, currency, dates and times should follow the format of the locale that is specified on the computer that opens the workbook.
The type of conversion that is performed is determined by the operator, which casts the values it requires before performing the requested operation.