SELECT FOR UPDATE

Learn SELECT FOR UPDATE in PostgreSQL through the exact construct, a dedicated example, a boundary case, and a mastery check.

12 min read • Intermediate

SELECT FOR UPDATE is an atomic PostgreSQL lesson inside Transactions & Locking. 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 SELECT FOR UPDATE rather than on generic PostgreSQL syntax.

Topic-specific example

postgresql-06-03.sql

sql Try It Live

BEGIN; SELECT * FROM jobs WHERE id=1 FOR UPDATE; COMMIT;

Edge case / engineering note

Test SELECT FOR UPDATE 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

SELECT FOR UPDATE Mastery Check →

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SAVEPOINT

SELECT FOR SHARE

SELECT FOR UPDATE

Topic-specific example

Lesson quizzes

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