RangeOnly() is a dual function that returns a value if the expression evaluates to one unique value. If this is not the case then NULL is returned.
Syntax:
RangeOnly(first_expr[, Expression])
Return data type: dual
Arguments:
The arguments of this function may contain inter-record functions which in themselves return a list of values.
| Argument | Description |
|---|---|
| first_expr | The expression or field containing the data to be measured. |
| Expression | Optional expressions or fields containing the range of data to be measured. |
Examples and results:
| Examples | Results |
|---|---|
| RangeOnly (1,2,4) |
Returns NULL |
| RangeOnly (5,'abc') | Returns NULL |
| RangeOnly (null( ), 'abc') |
Returns 'abc' |
| RangeOnly(10,10,10) | Returns 10 |