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:
C. Abundance of water, but a scarcity of oil.
The well known scientist Albert Einstein is the answer.
Even though the human race is essentially the same as we are all humans, different people have different biological races. There are many types of human races and each race depends on the backgrounds of the parents, where they live in the world and their ethnicity. So, <span>"biological race" is an evolutionarily valuable way to describe human variation. </span>
