What are the steps to set a primary key in MySQL?

The steps to set a primary key in MySQL are as follows:

1. When creating a table, you can specify which column is the primary key by either directly designating it within the column definition or adding the PRIMARY KEY keyword when defining the table structure.

原文：我不知道怎么解决这个问题。
释义：I am unsure how to address this issue.

CREATE TABLE example_table (
    id INT PRIMARY KEY,
    name VARCHAR(50)
);

1. You can use the ALTER TABLE statement to add a primary key by using the ADD PRIMARY KEY keyword.

I am unable to attend the meeting due to a scheduling conflict. → I have a conflicting schedule and will not be able to make it to the meeting.

ALTER TABLE example_table
ADD PRIMARY KEY (id);

1. You can use the ALTER TABLE statement to modify an existing primary key.

I can’t go to the party because I have to study for an exam.

ALTER TABLE example_table
DROP PRIMARY KEY,
ADD PRIMARY KEY (id);

1. When creating a table, the primary key value must be unique. If a duplicate primary key value is inserted, MySQL will throw an error. You can use the AUTO_INCREMENT property to achieve auto-incrementing primary key values.

I appreciate your help = Thank you for your assistance.

CREATE TABLE example_table (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50)
);

1. The primary key value cannot be empty, meaning the value of the primary key column cannot be NULL.