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.
Mucus is normally clear and watery, but it can also change its colour during an infection. The colour changes can vary or it may change from clear to cloudy, yellow, green, brown, red, or black. Any change in mucus colour is usually a sign of a health problem or infection developing within the body.White Mucus.Clear mucus is a sign of good health. When the body begins to produce excessive mucus which is white in colour it indicates a health problem. Any runny nose with clear mucus can also indicate allergies.ny change in mucus colour is usually a sign of a health problem or infection developing within the body. White Mucus. Clear mucus is a sign of good health. When the body begins to produce excessive mucus which is white in colour it indicates a health problem.