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.
Pale tongue: Introduction. Pale tongue: The occurrence of a pale tongue. See detailed information below for a list of 12 causes of Pale tongue, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Pale tongue: Causes | Symptom Checker Â».