SQL Custom Primary Keys Guide

1 year ago
Sophia Anderson
1 minute

In SQL, you can set up custom primary keys using the following methods:

When creating a table, use the PRIMARY KEY keyword to specify a column as the primary key, for example:

CREATE TABLE table_name (
    id INT PRIMARY KEY,
    ...
);

When creating a table, use the CONSTRAINT keyword to specify the primary key, for example:

CREATE TABLE table_name (
    id INT,
    ...
    CONSTRAINT pk_table_name PRIMARY KEY (id)
);

After creating the table, you can add a primary key constraint using the ALTER TABLE statement, for example:

ALTER TABLE table_name ADD CONSTRAINT pk_table_name PRIMARY KEY (id);

Either method can be used to customize the setting of the primary key. The primary key serves as a unique identifier for each row of data in a table, ensuring the uniqueness and integrity of the data.

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