What is the method for setting the primary key in a database?

The primary key of a database can be set using the following method:

1. When using the CREATE TABLE statement, specify the primary key while defining the table structure, for example: CREATE TABLE table_name (column1 data_type PRIMARY KEY, column2 data_type, …);
2. Use the ALTER TABLE statement to add a primary key constraint, for example: ALTER TABLE table_name ADD PRIMARY KEY (column1);
3. When designing table structure, select a specific column as the primary key in the table design interface.
4. Use the primary key tool in the table design interface to set the primary key.

Setting a primary key helps ensure the uniqueness and integrity of the data, regardless of the method used.