What is the function of a primary key in a table? to uniquely identify each record in the table to uniquely identify foreign keys in the table to secure table data to secure the foreign keys in the table

You turn your computer on and the computer will not boot up where is something you should do to diagnose the problem?

Answer the following questions regarding your system by using the commands listed in this chapter. for each question, write the command you used to obtain the answer. a. what are the total number of inodes in the root filesystem? how many are currently utilized? how many are available for use? b. what filesystems are currently mounted on your system? c. what filesystems are available to be mounted on your system? d. what filesystems will be automatically mounted at boot time?

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.