postgresqlHow do I use the PostgreSQL NVL function?
The PostgreSQL NVL function is used to replace a NULL value with an alternate value. This is useful in cases where you want to avoid errors caused by NULL values. The syntax for the NVL function is as follows:
NVL(expression1, expression2)
where expression1
is the expression to check for NULL values, and expression2
is the value to replace the NULL value with. For example:
SELECT NVL(NULL, 'foo');
This will return foo
as the output.
The NVL function can also be used with numerical values. For example:
SELECT NVL(NULL, 0);
This will return 0
as the output.
You can also use the NVL function with other expressions. For example:
SELECT NVL(NULL, 5 + 6);
This will return 11
as the output.
The NVL function is a useful tool for replacing NULL values in PostgreSQL.
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