EC
1592
MySQLERRORCommonEventsHIGH confidence

Event with same name already exists

Production Risk

Low — the CREATE EVENT fails; the existing event is unchanged.

What this means

An event with the same name already exists in the same schema.

Why it happens
  1. 1CREATE EVENT without IF NOT EXISTS when an event with that name already exists.
How to reproduce
trigger — this will error
trigger — this will error
CREATE EVENT my_event ON SCHEDULE EVERY 1 HOUR DO SELECT 1;
CREATE EVENT my_event ON SCHEDULE EVERY 2 HOUR DO SELECT 2;

expected output

ERROR 1592 (HY000): Event 'my_event' already exists

Fix 1

Use CREATE EVENT IF NOT EXISTS

Use CREATE EVENT IF NOT EXISTS
CREATE EVENT IF NOT EXISTS my_event ON SCHEDULE EVERY 1 HOUR DO SELECT 1;

Why this works

IF NOT EXISTS prevents the error when the event already exists.

Fix 2

Use ALTER EVENT to modify the existing event

Use ALTER EVENT to modify the existing event
ALTER EVENT my_event ON SCHEDULE EVERY 2 HOUR DO SELECT 2;

Why this works

ALTER EVENT modifies an existing event without needing to drop and recreate it.

Sources
Official documentation ↗

MySQL 8.0 — 1592 ER_EVENT_SAME_NAME

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