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.
White tongue is the result of an overgrowth and swelling of the fingerlike projections (papillae) on the surface of your tongue.The appearance of a white coating is caused by debris, bacteria and dead cells getting lodged between the enlarged and sometimes inflamed papillae.Causes of papillae hypertrophy or inflammation include, for example:xamples of conditions associated with white patches or other discolorations of your tongue include: 1  Use of certain medications, such as prolonged use of antibiotics that may bring on an oral yeast infection.