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Core SQL
CREATE TABLE INSERT SELECT WHERE ORDER BY LIMIT UPDATE DELETE DISTINCT Aliases
Expressions & Filters
AND OR NOT IN BETWEEN LIKE GLOB IS NULL CASE expression COALESCE NULLIF CAST
Joins & Grouping
INNER JOIN LEFT JOIN CROSS JOIN Self join GROUP BY HAVING COUNT SUM AVG MIN MAX GROUP_CONCAT FILTER clause
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PRIMARY KEY INTEGER PRIMARY KEY rowid UNIQUE NOT NULL CHECK FOREIGN KEY Generated columns STRICT tables WITHOUT ROWID ALTER TABLE
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Advanced SQLite
Common table expressions Recursive CTE Window ROW_NUMBER Window LAG UPSERT ON CONFLICT RETURNING clause ATTACH DATABASE VACUUM FTS5 virtual table Triggers
SQLite Complete Course / Joins & Grouping

Self join

Learn Self join in SQLite through the exact construct, a dedicated example, a boundary case, and a mastery check.

10 min read • Intermediate

Self join is an atomic SQLite lesson inside Joins & Grouping. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.

Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on Self join rather than on generic SQLite syntax.

Topic-specific example

sqlite-03-04.sql
sql Try It Live 
SELECT e.id,e.name,m.name AS manager_name FROM employees e LEFT JOIN employees m ON m.id=e.manager_id WHERE e.active=1 ORDER BY e.name;
Edge case / engineering note

Test Self join with an empty result, NULL/missing value, duplicate key, or concurrent operation where relevant; database behavior should be verified at the boundary shown by this example.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Self join Mastery Check →
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