How can the primary key be set in SQL Fiddle?

To set a primary key in SQL Fiddle, you can follow these steps:

1. Choose a schema (such as MySQL) in the “Schema Panel”.
2. Enter your SQL statement in the “Query Panel”.
3. Establish a table named “your_table_name” with columns column1, column2, and column3, where column1 is the primary key.
4. Create a table named “your_table_name” with three columns, specifying the data type for each column and setting column1 as the primary key.
5. Execute SQL statements in the “Query Panel”.

In this way, you have successfully set up the primary key in SQL Fiddle.