Combining Rows in SQL

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The clause used to combine rows from one table with another table in a SELECT statement is JOIN.

JOIN is a SQL keyword that is used to combine data from two or more tables based on a related column between them. It works by matching the values in a specified column in one table with the values in the same column in another table. The resulting table includes all the columns from the tables that are being joined.

The syntax for a JOIN statement typically involves specifying the tables to join and the columns to match, using the ON keyword. For example, to join a table named "customers" with a table named "orders" on the "customer_id" column, the statement might look like this:

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SELECT * FROM customers JOIN orders ON customers.customer_id = orders.customer_id; 

This would return a table that includes all columns from both the customers and orders tables, where the customer_id column matches in both tables.

In contrast, the SET keyword is used in SQL to perform operations such as union, intersect, and except between two or more select statements, but it does not combine rows from different tables.

The VALUES keyword is used to provide a set of literal values in a SQL statement, but it is not used to combine rows from different tables.

The KEY keyword is not a valid keyword in SQL and does not have any specific meaning in this context.