google-big-queryHow do I use the ISNULL function in Google BigQuery?
The ISNULL function in Google BigQuery is used to check if a value is null. It returns true if a value is null and false if a value is not null.
Example code
SELECT ISNULL(null_value) as is_null
FROM `project.dataset.table`
Output example
+----------+
| is_null |
+----------+
| true |
+----------+
The code above checks if the value of the column null_value
is null and returns true if it is.
The code consists of the following parts:
SELECT
: specifies the columns to be returnedISNULL(null_value)
: checks if the value of the columnnull_value
is nullas is_null
: gives the column a nameFROM
: specifies the table from which the data should be retrieved
For more information on the ISNULL function, please refer to the official BigQuery documentation: https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#isnull-function
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