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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I think the answer is Gibbons v ogden-1824
Answer: C. A species is brought to a new environment where it has no predators.
Explanation:
According to the <em>Green Invaders</em> article, invasive species are plant species that people brought with them when they moved to the United States because they wanted to make the vegetation more aesthetically pleasing.
The article mentioned how this could be bad for the ecosystem however because most insects are plant specific which means that they only feed on certain plants and without those plants, they could die off.
The insects are the predators for plants therefore and if they are unable to eat these new invasive plant species then that means that these plant species are now in an environment where they have no predators.
The different kinds of identity statuses. Mario would be classified into the Achievement identity-status category.
- Identity achievement is simply known as when an individual has taken an exploration and is presently committed.
Erikson's view about identity was said to be extended by Marcia, who described four identity statuses such as identity diffusion, foreclosure, moratorium and identity achievement.
An example is when people are able to differenciate to aspect who they want to be and what their life's aim is all about.
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