The number of records or rows in a table using MySQL can be got by using the COUNT statement.
Explanation:
- To counts all of the rows in a table, whether they contain NULL values or not, use COUNT
- That form of the COUNT() function basically returns the number of rows in a result set returned by a SELECT statement
- The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause.
- It sets the number of rows or non NULL column values.
- COUNT() returns 0 if there were no matching rows.
- The SQL COUNT function is an aggregate function that returns the number of rows returned by a query. You can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc.
Answer:
<em>The statement that describes a mobile device feature is docking stations can add some functionality to mobile devices such as video output.</em>
Explanation:
Because a docking station is a device that connects a mobile to multiple peripherals. It provides a single connection point that allows a mobile to function like a desktop computer.
Answer:
Option (A) is the correct answer.
Explanation:
A Computer system can be the target for the crime on which a criminal can acquire the information from the computer system which is stored on it. A Criminal is targeting the system with the help of some software that is entered on the computer system through a network.
In the above question, paragraphs are describing the content related to the crime which targets the computer system. This is a concept of a "computer as target". Hence option "A" is the correct answer while the other is not valid because--
- Option b suggests the concept behind the storage device of a computer but in the question, it is about the crime of a computer.
- Option c suggests the concept behind the computer is a criminal but in the question, it is about the crime of a computer.
- Option d suggests the concept behind the communication of a computer but in the question, it is about the crime of a computer.