Calculated field
IFNULL([amount], 0)
Sample data
| label | quantity | amount | flag |
|---|---|---|---|
| cedar cedar | 65 | 12.8 | True |
| ORCHID-west | 66 | -7.6 | False |
| maple-east | 67 | 0 | null |
| willow north | 68 | 25.3 | True |
| birch-birch | 69 | 4.9 | False |
| pine/south | 70 | -1.2 | null |
| ash | 71 | 9 | True |
| null | null | null | null |
The same calculation as SQL
SELECT coalesce(amount,0) AS result FROM input
Runs the example above.
SELECT coalesce(amount,0) AS result FROM input
Written for this dialect; not run here.
SELECT coalesce(amount,0) AS result FROM input
Written for this dialect; not run here.
Result
| result |
|---|
| 12.8 |
| -7.6 |
| 0 |
| 25.3 |
| 4.9 |
| -1.2 |
| 9 |
| 0 |
Same rows from the calculation and from the SQL in DuckDB.
Where a naive translation goes wrong
- Replacing IFNULL with amount changes the shown values or null handling.
Naive SQL
SELECT amount AS result FROM input
result 12.8 -7.6 0 25.3 4.9 -1.2 9 null Matches the calculation
SELECT coalesce(amount,0) AS result FROM input
result 12.8 -7.6 0 25.3 4.9 -1.2 9 0
Signature
IFNULL(expression, fallback)