The result of the above SQL statement will be the number 3, because the customer Smith has made 3 orders in total. If you don't specify a WHERE clause when using COUNT, your statement will simply return the total number of rows in the table, which in our case is 7:
Uses of Sleep Spindles Edit. Sleep spindles are one of several measures employed by the brain to keep a sleeper in an unconscious state. This pattern is produced during sleep to inhibit the processing of unnecessary information, which would especially interrupt stage 2 sleep.
Increased spindle activity occurs as the onset and outset of light sleep. Sleep spindles begin to develop once an infant has reached six weeks of age, and may explain why babies twitch in their sleep. EEG typically will display sleep spindles immediately after muscle twitching.