How are NULLs stored in a database?

Question

I\'m curious to know how NULLs are stored into a database ?

It surely depends on the database server but I would like to have an general idea about it.

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Answer 1

The problem with special values to indicate NULL is that sooner or later that special value will be inserted. For example, it will be inserted into a table specifying the special NULL indicators for different database servers

| DBServer     | SpecialValue |
+--------------+--------------+
| 'Oracle'     | 'Glyph'      |
| 'SQL Server' | 'Redmond'    |

;-)