Hi Subbu, A Qualifier allows a field to maintain different type of data.For example ,if 'date' is a field with quilifier ,then that date field can hold a) creation date b)sold date c)delivery date etc....
Why Does My Mucus Change Color? If you've ever stopped to look at the contents of the tissue after you've blown your nose, you may have noticed that your mucus isn't always perfectly clear. It may be yellow, green, or have a reddish or brownish tinge to it. What do those colors mean? You might have heard that yellow or green mucus is a clear sign that you have an infection, but despite that common misperception, the yellow or green hue isn't due to bacteria. When you have a cold, your immune system sends white blood cells called neutrophils rushing to the area.
Green yellow phlegm indicates a viral infection of the upper respiratory tract. A light yellow phlegm means that your body is healthy enough to fight the infection. Green phlegm in the chest could cause congestion and make breathing difficult.The best thing to do is to cough up green phlegm and clear the throat.reen phlegm mucus indicates bacterial infection in the sinus. It can be treated with antibiotics. If the thick green phlegm exists for more than a few days, it is best to consult a physician. Also keep in mind that too much of antibiotics may result in the germs becoming resistant to the drugs.