Only - chart function
Only() returns a value if there is one and only one possible result from the aggregated data. For example, searching for the only product where the unit price =9 will return NULL if more than one product has a unit price of 9.
Syntax:
Only([{SetExpression}] [TOTAL [<fld {,fld}>]] expr)
Return data type: dual
Argument | Description |
---|---|
expr | The expression or field containing the data to be measured. |
SetExpression | By default, the aggregation function will aggregate over the set of possible records defined by the selection. An alternative set of records can be defined by a set analysis expression. |
TOTAL | If the word
TOTAL occurs before the function
arguments, the calculation is made over all possible values given
the current selections, and not just those that pertain to the current dimensional value, that is, it disregards the chart dimensions. By using TOTAL [<fld {.fld}>], where the TOTAL qualifier is followed by a list of one or more field names as a subset of the chart dimension variables, you create a subset of the total possible values. |
Tip noteUse Only() when you want a NULL result if there are multiple possible values in the sample data.
Example | Result |
---|---|
Only(Category) | Displays the Category as long as it is unique within the context. |