RangeNullCount() finds the number of NULL values in the expression or field.
Syntax:
RangeNullCount(firstexpr [,Expression})
Return data type: integer
Arguments:
The argument expressions of this function may contain inter-record functions with a third optional parameter, which in themselves return a range 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 |
|---|---|
| RangeNullCount (1,2,4) |
Returns 0 |
| RangeNullCount (5,'abc') | Returns 0 |
| RangeNullCount (null( ), null( )) |
Returns 2 |
Example with expression:
RangeNullCount (Above(Sum(MyField),0,3))
Returns the number of NULL values in the three results of the Sum(MyField) function evaluated on the current row and two rows above the current row.
Data used in examples:
| MyField |
RangeNullCount(Above(Sum(MyField),0,3)) |
|---|---|
| 10 | Returns 2 because there are no rows above this row so 2 of the 3 values are missing (=NULL). |
| 2 | Returns 1 because there is only 1 row above the current row so 1 of the 3 values is missing (=NULL). |
| 8 | Returns 1 because 1 of the 3 rows includes a non-numeric ('abc'). |
| null | Returns 1 because current row is a NULL value. |
| 5 | Returns 1 because row above is a NULL value. |
| 9 | Returns 1 because value 2 rows above the current row is a NULL value. |
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