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.
Sinusitis arises from the inflammation of the sinuses with a viral, bacterial, or fungal infection. Many people think that a yellow or green nasal discharge means a bacterial infection, which requires antibiotics but it is not true.It can be a sign that your body is being attacked by either a bacteria or a virus. That said, a yellow discharge does not necessarily indicate a sinus infection.inusitis arises from the inflammation of the sinuses with a viral, bacterial, or fungal infection. Many people think that a yellow or green nasal discharge means a bacterial infection, which requires antibiotics but it is not true.