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.
spot under tongue pierce. Secondly, tongue piercing is another cause of dark spots on tongue and lips. After the tongue piercing has healed, a dark spot is left on the tongue. The piercing also can lead to dark spot on tongue symptoms because the practice promotes fungal infections. More so, at pierce point, normal tongue pigmentation is lost.
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.