lesson

Schema Design

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45 minlesson

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1 min read

Schema Design: Tables, Relationships, and Constraints

A well-designed schema makes data consistent, queryable, and scalable. In this lesson you practice joining two tables.

What is a JOIN?

A JOIN combines rows from two or more tables based on a related column. The most common is an inner join, which returns only rows where the join condition matches in both tables.

sql

SELECT posts.title, users.name
FROM posts
JOIN users ON posts.user_id = users.id;

Your Task

Return each post title alongside the name of the user who wrote it by joining posts and users on user_id.

You completed the free preview — you are ready for the full path.

All lessons are readable below. To write and run code from lesson 11 onwards, upgrade to Path Plus ($9/mo) or Pro.

1 min read

Schema Design: Tables, Relationships, and Constraints

A well-designed schema makes data consistent, queryable, and scalable. In this lesson you practice joining two tables.

What is a JOIN?

A JOIN combines rows from two or more tables based on a related column. The most common is an inner join, which returns only rows where the join condition matches in both tables.

sql

SELECT posts.title, users.name
FROM posts
JOIN users ON posts.user_id = users.id;

Your Task

Return each post title alongside the name of the user who wrote it by joining posts and users on user_id.

1 min read

Schema Design: Tables, Relationships, and Constraints

A well-designed schema makes data consistent, queryable, and scalable. In this lesson you practice joining two tables.

What is a JOIN?

A JOIN combines rows from two or more tables based on a related column. The most common is an inner join, which returns only rows where the join condition matches in both tables.

sql

SELECT posts.title, users.name
FROM posts
JOIN users ON posts.user_id = users.id;

Your Task

Return each post title alongside the name of the user who wrote it by joining posts and users on user_id.

1 min read

Schema Design: Tables, Relationships, and Constraints

A well-designed schema makes data consistent, queryable, and scalable. In this lesson you practice joining two tables.

What is a JOIN?

A JOIN combines rows from two or more tables based on a related column. The most common is an inner join, which returns only rows where the join condition matches in both tables.

sql

SELECT posts.title, users.name
FROM posts
JOIN users ON posts.user_id = users.id;

Your Task

Return each post title alongside the name of the user who wrote it by joining posts and users on user_id.