Securing Data Integrity in PostgreSQL with Key Constraints

Securing Data Integrity in PostgreSQL with Key Constraints

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DbVisualizer
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Data integrity is critical for any database, and PostgreSQL provides robust tools to enforce it. This article offers a concise overview of how you can use constraints to keep your data consistent and reliable.

NOT NULL Constraint

Ensures certain fields always have a value.

CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    email VARCHAR(250) NOT NULL,
    password VARCHAR(250) NOT NULL
);

UNIQUE Constraint

Guarantees uniqueness across a column’s values.

CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    email TEXT UNIQUE
);

PRIMARY KEY Constraint

A unique identifier for records, without NULLs.

CREATE TABLE logs (
    id SERIAL PRIMARY KEY,
    data JSONB
);

FOREIGN KEY Constraint

Ensures data integrity across related tables.

CREATE TABLE orders (
    id SERIAL PRIMARY KEY,
    customer_id INT NOT NULL REFERENCES customers(id)
);

Conclusion

PostgreSQL constraints are vital tools for preserving the integrity of your data. They help enforce rules and maintain consistent relationships across your database. For a more detailed exploration, visit the article Understanding PostgreSQL Data Integrity.

PostgreSQL