Question

Combining two or more rows and columns to form a single row or column is called _________.​

Answer 1

⎝⎝⫸⫷ANSWER⫸⫷⎠⎠

A UNION is used to combine the rows of two or more queries into one result. The Union is called a set operator. There are some special conditions that must occur in order for a union to work. First, each query must have the same number of columns