It is not uncommon to use the IN operator in WHERE statement. Such an example is the filtering operation by enumerated values, say, the customer age groups, by regions, or by orders. An IN condition ...

Learn how to use the UNION operator in SQL, a set operation that combines the rows from two or more queries into one result set. Discover the benefits, limitations, and examples of using it.

##SQL_UNION The UNION operator is used to combine the result-set of two or more SELECT statements. Every SELECT statement within UNION must have the same number of columns The columns must also have ...