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• 10:55, 20 May 2024 Carli talk contribs created page Advanced SQL Tutorial (Created page with "== Atomic Counters through Unique Key Checks == Imagine the following table: CREATE TABLE u(id INT PRIMARY KEY, cnt INT); INSERT INTO u VALUES (1, 2), (2, 4); SELECT * FROM u; +------+------+ | id | cnt | +------+------+ | 1 | 2 | | 2 | 4 | +------+------+ '''3 rows in set (0,001 sec)''' If you want to add to <code>cnt</code> whenever an event occurs, add a unique key over <code>id</code> and do the following: INSERT INTO u VALUES (2, 1) O...") Tag: Visual edit