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:
Following options are both quantitative and continuous.
1. The amount of tar in a cigarette, measured in milligrams (mg).
3. The time it takes in minutes for a student to walk from the parking lot to their classroom.
Explanation:
Quantitative variables are the numerical variables which can be measured. For example, population of a city.
Continuous variables are also numeric but it have any number of values between its minimum and maximum value. Like in statistics we have age, height, color of eye etc as continuous variables.
In the given options, Option 1, amount of tar cigarette, is both quantitative and continuous as it have numeric value between any two values.
3. Time is measured and can range between any two values (to walk from parking area to classroom) so it is both quantitative and continuous.
I believe the answer is: <span>the importance of quality time spent between parents and children, which is so difficult for the poor to find.
The story indicates that the parents in the poor family would most likely to spent most of their days doing long hours in their jobs to fulfill the family's ends meet.
This would make them do not possess enough time to properly pay attention to their children.</span><span />
Answer:
Transmission Control Protocol
Explanation:
The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite. It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, the entire suite is commonly referred to as TCP/IP. TCP provides reliable, ordered, and error-checked delivery of a stream of octets (bytes) between applications running on hosts communicating via an IP network. Major internet applications such as the World Wide Web, email, remote administration, and file transfer rely on TCP. Applications that do not require reliable data stream service may use the User Datagram Protocol (UDP), which provides a connectionless datagram service that emphasizes reduced latency over reliability
source: (Wikipedia)
