Question

In an SQL query of two tables, which SQL keyword indicates that we want data from all the rows of one table to be included in the result, even if the row does not correspond to any data in the other table?

1) LEFT JOIN
2) RIGHT JOIN
3) INCLUDE
4) A and B
5) A, B, and C

Answer 1

The SQL keyword that indicates including all rows from one table in the result, even without matching data in the other table, is LEFT JOIN.

Step-by-step explanation:

The SQL keyword that indicates that we want data from all the rows of one table to be included in the result, even if the row does not correspond to any data in the other table, is LEFT JOIN.

A LEFT JOIN returns all the rows from the left table and the matching rows from the right table. If there is no match, NULL values are returned for the columns of the right table.

For example, suppose we have two tables: Customers and Orders. We can use a LEFT JOIN to get all the customers and their corresponding orders, even if some customers have not placed any orders.