Write sql queries to answer the following questions:
a. which students are enrolled in database and networking? (hint: use sectionno for each class, so that you can determine the answer from the registration table by itself.
b. which instructors can teach either syst analysis or syst designwrite sql queries to answer the following question
c. which courses were taught in the first semester of 2008 but not in the second semester of 2008.

What is wi-fi infrastructure? a metropolitan area network that uses radio signals to transmit and receive data a communications technology aimed at providing high-speed wireless data over metropolitan area networks a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves includes the inner workings of a wi-fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a wi-fi signal

These factors limit the ability to attach files to e-mail messages. location of sender recipient's ability to open file size of file type of operating system used

E-commerce builds on traditional commerce by adding the flexibility that networks offer and the availability of the internet. - true or false