Count Distinct function.
| C# | Visual Basic | Visual C++ |
public static readonly ExprAggregate.ExprAggregate..::ExprAggregateOp COUNTDISTINCT
Public Shared ReadOnly COUNTDISTINCT As ExprAggregate..::ExprAggregateOp
public: static initonly ExprAggregate..::ExprAggregateOp^ COUNTDISTINCT
Counts the distinct values in a field, with no repetition.