and are most likely to used when your playing with the subqueries in MySQL. So these will be used when you want to perform operation based on checking row existance of the other table or even same table. If sub query will return any value then EXISTS will be and NOT EXISTS will be . [...]
and are the datatypes of the MySQL. This article is to cover similarity and difference of both datatypes. Both are almost same but for some aspects both behave slight different based on condition. Introduction CHAR and VARCHAR are almost same but both are different at the stage of storing and retriving the data from the [...]