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.
Blister on tip of the tongue. What causes blisters on the tip of your tongue? This condition is commonly caused by injuries. There are also some other conditions like infections that can cause this condition. The blisters can be small, big, multiple or clustered. White bumps and spots begin to show when the condition begins to heal.