Guides/ReportDesign/15.0-Expressions-in-Izenda.md
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- **count(Distinct [OrderID])** produces a count of all distinct OrderID values.
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-- **datediff(part, [begindate], [enddate])** allows you to calculate the difference between two datetimes with a user selected level of granularity, for example the number of days, hours, or minutes between both input values.
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+- **datediff(part, [begindate], [enddate])** allows you to calculate the difference between two datetimes with a user selected level of granularity, for example the number of days, hours, or minutes between both input values. More information can be found [[here|http://wiki.izenda.us/FAQ/How-to-use-datediff]].
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- **distinct(OrderID)** produces a list of all distinct OrderID values. This is an _**Oracle only**_ function.
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