In Perl, an array is a data structure that stores a collection of elements. An array can be declared using the @ symbol, followed by the list of elements enclosed in parentheses. For example:
my @array = (1, 2, 3, 4, 5);
To check if an array is null, you can use the defined() function. The defined() function returns true if the variable passed to it is defined and not null, and false otherwise. For example:
In Oracle, a NULL value represents a missing or unknown value. It is distinct from zero or an empty string, and it indicates that no data is available for a particular column or attribute.
Checking for NULL values is crucial in data management tasks such as data cleaning, data analysis, and query optimization. By identifying and handling NULL values appropriately, you can ensure the integrity and accuracy of your data.
