MySQL Primary Key Creation Methods

1 year ago
William Carter
1 minute

There are several methods to create a primary key in MySQL.

  1. Specify the primary key constraint when creating a table.
CREATE TABLE table_name (
  id INT PRIMARY KEY,
  column1 datatype,
  column2 datatype,
  ...
);
  1. Add a primary key constraint to an existing table using the ALTER TABLE statement.
ALTER TABLE table_name
ADD PRIMARY KEY (id);
  1. Use auto-increment primary key when creating a table.
CREATE TABLE table_name (
  id INT AUTO_INCREMENT PRIMARY KEY,
  column1 datatype,
  column2 datatype,
  ...
);
  1. Create a primary key using the UNIQUE constraint.
CREATE TABLE table_name (
  id INT,
  column1 datatype,
  column2 datatype,
  ...
  PRIMARY KEY (id)
);
  1. Create a primary key index using the CREATE INDEX statement.
CREATE TABLE table_name (
  id INT,
  column1 datatype,
  column2 datatype,
  ...
);

CREATE UNIQUE INDEX index_name
ON table_name (id);

There are common methods for creating a primary key in MySQL, and the specific method chosen will depend on the specific requirements and data table structure.

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