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.
Glossitis causes a swollen tongue due to a variety of infectious or inflammatory conditions. Infectious conditions include a tongue bacterial infection, yeast infection or viral infection, such as herpes simplex. Conditions that cause tongue inflammation or irritation include exposure to very hot foods or beverages, spicy foods, tobacco and alcohol.