Within the WHERE clause, the FROM clause, and collection subqueries, you can utilise the UNION and UNION ALL operators in SELECT statement subqueries.
We may also join multiple tables and create a new table with data using the SELECT INTO method.
To merge the result sets of two or more SELECT statements, use the SQL UNION ALL operator. Between the multiple SELECT statements, it does not eliminate duplicate rows (all rows are returned). Within the UNION ALL, each SELECT statement must have the same amount of fields in the result sets with similar data types.
The SELECT INTO statement is used to copy data from one table to another.
The UNION operator combines the results of multiple SELECT queries into a single query.
