When working with nullable fields, it's important to understand that NULL does not behave like a typical numeric value. If you try to add 1 to a NULL in PL/SQL (null + 1), the resulting value will itself be NULL ...
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Null in PL/SQL: Definition, Uses, and Best Practices
In PL/SQL, null represents the absence of a value or the unknown state. It is not the same as zero or an empty string; rather, it signifies the absence of any defined data. It can be used to indicate missing ...