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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In sociology, Marx's theories are used to study society through economic systems. ... Conflict theory has been used to examine several aspects of society that are built upon class conflict, which Marx argued were designed to protect the wealthy, not society as a whole.
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Explanation:
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Answer:
D) shaping.
Explanation:
Shaping: This is one of the techniques used in behavior modification and is implemented by the behaviorist B. F Skinner while testing the operant conditioning principles. It is also known as successive approximations method.
Shaping in psychology is defined as a method of behavior modification in which reinforcement is given for the completion of the desired target behavior. Shaping plays a vital role in commercial animal training.
Example: An autistic child can be taught of new behavior through shaping technique.