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While reading manual of Mondrian I found that it has not so much types including Integer and Numeric - what's difference between this types?
And how can I use timestamp level type?
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Well, Integer type can contain only whole numbers, like 5 or 123. Numeric type can contain decimal numbers like 15.39.
Number is a noun - 数目字. Numeric is an adjective meaning relating or expressed as numbers Examples: Numbers are numeric characters.
Numeric types consist of two-, four-, and eight-byte integers, four- and eight-byte floating-point numbers, and selectable-precision decimals.
In contrast, integer and decimal data types are exact numeric values.
Well, Integer type can contain only whole numbers, like 5 or 123. Numeric type can contain decimal numbers like 15.39.
About the second question: I think you're asking about Time dimensions, not the Timestamp (which is type). In this case it's better to refer the Mondrian documentation:
http://mondrian.pentaho.com/documentation/schema.php#Time_dimensions
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