Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

SQL join

Combining rows from two tables that match on a column.

A JOIN combines rows of two tables where a condition holds (typically a foreign key equals a primary key); INNER keeps matches only, LEFT keeps every left row.

See also

primary key query builder ORM
Read the full section →