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.
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.