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.
Oral Fungus Causes Common Mouth Infection. If you want to avoid or control a common infection called oral thrush, you've got one more reason to visit your dentist, especially if you have diabetes, wear dentures or have a problem with your immune system. Also called candidiasis, the fungal infection causes painful white spots on the tongue or inner cheeks. The lesions may bleed slightly when scraped or when you brush your teeth. Sometimes oral thrush spreads to the roof of the mouth, gums, tonsils or the back of the throat.