Question

When is a non-equality join used?

1) When related columns can be joined with an equal sign
2) When there are equivalent rows in the tables to be joined
3) When related columns can't be joined with an equal sign
4) When there are no equivalent rows in the tables to be joined

Answer 1

A non-equality join is used when related columns cannot be joined with an equal sign. It allows for more flexible and customizable data analysis queries.

Step-by-step explanation:

A non-equality join is used when related columns cannot be joined with an equal sign. In a non-equality join, the comparison between the related columns is based on a condition that is not equality. For example, you might want to join two tables based on a condition.

Where one column is greater than or less than the corresponding column in the other table. One scenario where a non-equality join is commonly used is when comparing dates. For instance, you may want to join a table of sales data with a table of promotions.

It based on a condition where the sale date falls within the promotion start and end dates. Non-equality joins allow for a flexible way of joining tables based on different conditions, providing more powerful and customizable data analysis queries.