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Core PostgreSQL
SERIAL and identity columns RETURNING ILIKE DISTINCT ON LIMIT OFFSET VALUES table constructor Type casts :: Dollar-quoted strings Search path Temporary tables
Data Types
UUID JSONB Arrays Range types INET and CIDR NUMERIC precision TIMESTAMPTZ INTERVAL ENUM type Composite type
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Transactions & Locking
Transaction isolation SAVEPOINT SELECT FOR UPDATE SELECT FOR SHARE Advisory locks Deadlock example Serializable retry Deferrable constraints Two-phase commit SKIP LOCKED
Functions & Server Features
SQL function PL/pgSQL function DO block Trigger function Generated columns LISTEN and NOTIFY COPY command Upsert ON CONFLICT MERGE statement Extensions CREATE EXTENSION
Administration & Performance
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PostgreSQL Complete Course / Queries & Joins

FULL OUTER JOIN

Learn FULL OUTER JOIN in PostgreSQL through the exact construct, a dedicated example, a boundary case, and a mastery check.

10 min read • Intermediate

FULL OUTER JOIN is an atomic PostgreSQL lesson inside Queries & Joins. 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 FULL OUTER JOIN rather than on generic PostgreSQL syntax.

Topic-specific example

postgresql-03-02.sql
sql Try It Live 
SELECT * FROM a FULL OUTER JOIN b USING(id);
Edge case / engineering note

Test FULL OUTER 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

FULL OUTER JOIN Mastery Check →
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LATERAL join
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CROSS JOIN LATERAL