RangeNullCount() finds the number of NULL values in the expression or field.
Syntax:
RangeNullCount(first_expr [, Expression])
Return data type: integer
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 |
|---|---|
| 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.
| 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). |
| 'abc' | Returns 1 because there is only one row above the current row, so one of the three values is missing (=NULL). |
| 8 | Returns 0 because none of the three rows is a NULL value. |
Data used in examples:
RangeTab:
LOAD * INLINE [
MyField
10
'abc'
8
] ;
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