What is the principle purpose of the primary key? (points : 3) primary keys uniquely identify a row of data within a database table.
keys used in first normal form are known as primary keys. second normal form keys are known as secondary keys, and 3nf keys are called tertiary keys.
primary keys uniquely identify a column of data within a database table.
the primary key secures the table by locking it against unauthorized access.

Researchers measured the data speeds for a particular smartphone carrier at 50 airports. the highest speed measured was 78.1 mbps. the complete list of 50 data speeds has a mean of x overbarequals16.11 mbps and a standard deviation of sequals18.65 mbps. a. what is the difference between carrier's highest data speed and the mean of all 50 data speeds? b. how many standard deviations is that [the difference found in part (a)]? c. convert the carrier's highest data speed to a z score. d. if we consider data speeds that convert to z scores between minus2 and 2 to be neither significantly low nor significantly high, is the carrier's highest data speed significant? a. the difference is nothing mbps.

Which text function capitalizes the first letter in a string of text? question 10 options: upper capital first proper

Light travels at a speed of 186,000 miles a second. the distance light travels in a year is 5,865,690,000,000 miles/year 5,865,695,000,000 miles/year 58,656,950,000,000 miles/year 6,789,000,0000 miles/year