What Six Guidelines Do You Need to Follow When You

question 79

Essay

What six guidelines do you need to follow when you create your own SQL queries?

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Definitions:

Standard Deviation

An indicator of the spread or variability within a data set; where a small standard deviation indicates values closely clustered around the average, and a large standard deviation suggests they are widely scattered.

Z-score

A statistical measure that describes a value's position relative to the mean of a group of values, expressed in units of standard deviation.

Z

In statistics, often represents the standard score, which is the number of standard deviations a data point is from the mean.

Percentage

A way of expressing a number as a fraction of 100, used to compare proportions.