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.
Median rhomboid glossitis is a condition that can affect your tongue if you have oral thrush. It causes a red, smooth patch or lump to develop in the middle of the top part of your tongue, which can be sore. You're more likely to develop oral thrush if you: have recently taken antibiotics.
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».