Question

A ___ is: Give me the above as well as all the rows of tableA that have not been included in the result of the inner join (even if there is no common field).

Answer 1

An inner join in the context of databases returns only the rows with matching values in both tables. To include all rows from table A that were not included in the inner join result, you can use a left join.

Step-by-step explanation:

In the context of databases, an inner join is a type of join operation that returns only the rows that have matching values in both tables being joined. If there is no common field between the two tables, no rows will be returned. In the case where there are no matching values, the result of the inner join will be empty.

However, to include all the rows from table A that have not been included in the result of the inner join, including those rows that do not have a common field, you can perform a LEFT JOIN or LEFT OUTER JOIN. This will return all the rows from table A regardless of whether there is a match in table B or not.

For example, if we have table A with rows 1, 2, 3 and table B with rows 2, 3, 4, the inner join will give us rows 2 and 3 (the matching values), while the left join will give us rows 1, 2, and 3 (including the non-matching values).