EXAMPLE - COUNT Functions
This example demonstrates how to count the number of values and non-null values within a group.
Functions:
Item | Description |
|---|---|
COUNTA Function | Generates the count of non-null rows in a specified column, optionally counted by group. Generated value is of Integer type. |
COUNTDISTINCT Function | Generates the count of distinct values in a specified column, optionally counted by group. Generated value is of Integer type. |
Source:
In the following example, the seventh row is an empty string, and the eighth row is a null value.
rowId | Val |
|---|---|
r001 | val1 |
r002 | val1 |
r003 | val1 |
r004 | val2 |
r005 | val2 |
r006 | val3 |
r007 | (empty) |
r008 | (null) |
Transformation:
Apply a COUNTA function on the source column:
Transformation Name |
|
|---|---|
Parameter: Formula type | Single row formula |
Parameter: Formula | COUNTA(Val) |
Parameter: New column name | 'fctnCounta' |
Apply a COUNTDISTINCT function on the source:
Transformation Name |
|
|---|---|
Parameter: Formula type | Single row formula |
Parameter: Formula | COUNTDISTINCT(Val) |
Parameter: New column name | 'fctnCountdistinct' |
Results:
Below, both functions count the number of values in the column, with COUNTDISTINCT counting distinct values only. The empty value for r007 is counted by both functions.
rowId | Val | fctnCountdistinct | fctnCounta |
|---|---|---|---|
r001 | val1 | 4 | 7 |
r002 | val1 | 4 | 7 |
r003 | val1 | 4 | 7 |
r004 | val2 | 4 | 7 |
r005 | val2 | 4 | 7 |
r006 | val3 | 4 | 7 |
r007 | (empty) | 4 | 7 |
r008 | (null) | 4 | 7 |