google-big-queryHow can I use IFNULL in Google BigQuery?
IFNULL is a Google BigQuery function that can be used to replace NULL values in a result set with a specified value. This is useful when working with data that contains NULL values and you want to replace them with a value of your choice.
The syntax for using the IFNULL function is as follows:
SELECT IFNULL(column_name, replacement_value)
FROM table_name
For example, if you have a table with the following data:
id | name |
---|---|
1 | John |
2 | NULL |
You can use the IFNULL function to replace the NULL value with a string of your choice, such as "Unknown":
SELECT IFNULL(name, 'Unknown')
FROM table_name
This will return the following result set:
name |
---|
John |
Unknown |
The IFNULL function can also be used to replace NULL values in calculations. For example, if you want to calculate the average of a column that contains NULL values, you can use the IFNULL function to replace the NULL values with a value of your choice:
SELECT AVG(IFNULL(column_name, 0))
FROM table_name
This will return the average of the column with the NULL values replaced by 0.
For more information on the IFNULL function, please refer to the BigQuery Documentation.
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