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.
As it is mostly caused by overgrowth of fungus called Candida, this condition is also referred to as Candidiasis of the mouth and throat. The presence of white patches on the surface of the tongue and bad breath are the most common white coated tongue symptoms. The coating can also be yellow or brown in color.In severe cases, coated tounge may appear as though it is covered with fur or hair (Hairy Tongue). Coated tongue causes no pain in most of the cases. The condition is more common in infants, people wearing dentures and individuals with weakened immune system.he presence of white patches on the surface of the tongue and bad breath are the most common white coated tongue symptoms. The coating can also be yellow or brown in color. In severe cases, coated tounge may appear as though it is covered with fur or hair (Hairy Tongue).