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what does the LIMIT keyword do?
The LIMIT keyword limit the number of record as you expect
You can learn more here "https://www.w3schools.com/sql/default.asp"
Limit will help you to select only particular number of entries e.g. 1 in this case
suppose there are multiple cities with min length ( as it is in this case, 3 cities) , your 'limit' displays the number of cities as per set by you.