Answer:
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Explanation:
The answer is Count. Count is an aggregate method in SQL that returns the number of rows for a specified column that have non-null values.
<h3>What is the Meaning of Null?</h3>
When a field in a database has no values at all, this is known as null and indicates that the field’s value is unknown.
A null value for a number field, text field, or space value is different from a zero value. Null indicates that no value has been recorded in a database field.
A value and a null cannot be compared. The Structured Query Language query cannot be written as SELECT * FROM Customer where email Address=null, for instance, if it is intended to obtain all customers without email addresses from a Customer Addresses table.
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Answer:
Myelin
Explanation:
Myelin is a fatty substance that surrounds nerve cell axons to insulate them and increase the rate at which information is passed along. The myelin can be compared to the protective coating of an electrical wire.
Beth often falls sick, and when she does, she receives a lot of attention from her mother who dotes over her. Beth's illnesses are most likely to be maintained by secondary gains.
Chronic diseases consist of asthma, coronary heart illnesses, stroke, diabetes, and arthritis. Those diseases often may be averted or controlled keeping chance elements, which include excessive blood pressure, excessive cholesterol, and extended blood sugar levels, below manage.
The point of interest is truly on uncommon diseases, however, a credible case may be made that there are at least 10,000 illnesses inside the global, though there may be probably extra.
In line with cutting-edge information, hepatitis B is the maximum not unusual infectious disease in the global, affecting some 2 billion human beings it is more than one zone of the world's population.
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