The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with a NULL value is a field with no value. It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.
Someone with red spots on their tongue may be suffering from geographic tongue, according to Mayo Clinic. Other causes of red spots on the tongue include folic acid and vitamin B-12 deficiencies and scarlet fever, WebMD states. Continue Reading.
White coating on tongue due to Oral Thrush is caused because of an increase in the growth of Candida Albicans, a form of fungus naturally present in various parts of the body. Under normal circumstances, certain good bacteria help to maintain a balance in the growth of these micro organisms.