Question

Equi-Join vs Natural Join vs INNER JOIN .. USING(field)

Option 1: Equi-Join
Option 2: Natural Join
Option 3: INNER JOIN
Option 4: USING(field)

Answer 1

SQL joins, including Equi-Join, Natural Join, and INNER JOIN using a specific column, are methods for combining rows from multiple tables based on related columns, with each having its own syntax and use cases.

Step-by-step explanation:

The question pertains to different types of joins in SQL, which are methods of combining rows from two or more tables based on a related column between them. An Equi-Join is a specific type of join that combines rows with equivalent values in the specified columns. A Natural Join automatically joins tables by all columns with the same name. Meanwhile, INNER JOIN is a general join process that retrieves records that have matching values in both tables, but requires specifying the condition explicitly unless combined with USING(field), which is similar to an equi-join but only specifies the columns you want to join on and doesn't require repeating the join column in both tables.