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PostgreSQL Complete Course / Functions & Server Features

PL/pgSQL function

Learn PL/pgSQL function in PostgreSQL through the exact construct, a dedicated example, a boundary case, and a mastery check.

12 min read • Advanced

PL/pgSQL function is an atomic PostgreSQL lesson inside Functions & Server Features. 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 PL/pgSQL function rather than on generic PostgreSQL syntax.

Topic-specific example

postgresql-07-02.sql
sql Try It Live 
CREATE FUNCTION greet(n text) RETURNS text LANGUAGE plpgsql AS $$ BEGIN RETURN 'Hello '||n; END $$;
Edge case / engineering note

Test PL/pgSQL function 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

PL/pgSQL function Mastery Check →
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