Null
| Input | Output | Alias |
|---|---|---|
| ✗ | ✔ |
Description
In the Null format - nothing is output.
This may at first sound strange, but it's important to note that despite outputting nothing, the query is still processed,
and when using the command-line client, data is transmitted to the client.
tip
The Null format can be useful for performance testing.
Example Usage
Connect to play.clickhouse.com with clickhouse client:
Run the following the query:
Note how 1000 rows were processed, but 0 rows were output in the result set.