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.
Red spots on tongue may be caused due to a harmless condition or a severe underlying disease. Hence, it is important for all patients to consult a doctor for diagnosis and treatment. Symptoms. 1  Red spots on tongue may sometimes develop as red bumps. 2  Such unsightly bumps may be painful and elicit a burning sensation.