To calculate numbers of days between two colums, MySQL has Datediff function for calculation between two dates.

This query will check Today's Date by Now() function of MySQL and calculate days from "Example" date until today.

Datediff Usage is not well-known by communities and many people are doing these calculations with additional requirements. 

Using this query can save "PHP" side codings by solving them on "Query Stage" without requiring to be proceed from raw.

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