Glossary term
What is LEFT JOIN?
In Apex Flow Academy, "LEFT JOIN" means: A join that keeps every row from the first table, and fills the other side with NULL when there is no match. It is taught in SQL: Ask Any Database Any Question. Related terms include INNER JOIN, Grain, Join and Fan-out. Every Apex Flow Academy course lists the official sources it checked.
- 1 course teaches it
- plain-word definition
The facts
What is LEFT JOIN?
A join that keeps every row from the first table, and fills the other side with NULL when there is no match.
Where is LEFT JOIN taught?
LEFT JOIN is defined in SQL: Ask Any Database Any Question.
Which lessons cover LEFT JOIN?
These lessons name it in their title or objectives:
- SQL: Ask Any Database Any Question, lesson 4.3: LEFT JOIN: Keep Rows With No Match
Which terms are related to LEFT JOIN?
Next to LEFT JOIN in the course glossaries: INNER JOIN, Grain, Join, Fan-out, HAVING, Subquery, GROUP BY and CTE (WITH).
The hard questions, answered straight
Bold questions people really ask. Each answer comes from the course data or a settled Academy fact.
Do I need experience before I learn LEFT JOIN?
It depends on the course. Each course that teaches it lists its own prerequisites, and all are listed at beginner level:
- SQL: Ask Any Database Any Question: No coding or database experience is needed.