amazon-redshiftHow do I use the NVL function in Amazon Redshift?
The NVL function in Amazon Redshift is used to replace null values with a specified value. It takes two arguments, the first being the value to be tested for null and the second being the value to be returned if the first argument is null. The syntax is as follows:
NVL(value, replacement)
For example, if we have a table called sales
with a column amount
that contains the following data:
amount |
---|
100 |
NULL |
300 |
We can use the following query to replace the NULL
value with 0
:
SELECT NVL(amount, 0) AS amount FROM sales;
The output of this query would be:
amount
100
0
300
The parts of the code are:
NVL
: The function used to replace null valuesamount
: The value to be tested for null0
: The value to be returned ifamount
is nullSELECT
: The SQL statement used to perform the queryAS
: An optional clause used to rename the output column
For more information, please see the following links:
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