Having many null values in your database wastes space and causes problems working out totals.
What are NULL values in SQL?
The SQL NULL is known to be a word that connote a term used that is often used to depict a missing value.
A null value can be seen in any form of a relational database is known to also be one that is often used if the value in a column is said to unknown or missing.
Note that there are different kinds of database system and as such one can say that A null value in a relational database is used when the value in a column is unknown or missing and then it acts in its place.
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