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.
A tongue that looks white in patches may indicate another condition, thrush, a type of oral yeast infection. This may be caused if you have recently taken antibiotics, and itâs not uncommon in infants and the elderly.enerally, the occasional white tongue, especially when the whole tongue is white (not white in spots or patches), is due to minor inflammation of papillae, the tiny bumps that coat your tongue.