4098
MySQLWARNINGCriticalHIGH confidence
TIMESTAMP with DEFAULT NULL is deprecated
Production Risk
Low — Current behavior is preserved, but schema may break in future MySQL versions.
Why it happens
- 1A TIMESTAMP column was defined without an explicit DEFAULT value and NULL was assigned by the server.
- 2Older schema definitions that relied on implicit TIMESTAMP defaults are being used.
Fix
Explicitly define the DEFAULT for TIMESTAMP columns
Explicitly define the DEFAULT for TIMESTAMP columns
ALTER TABLE t MODIFY col TIMESTAMP NULL DEFAULT NULL;
Why this works
Make the NULL default explicit to silence the warning and prepare for future compatibility.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 4098 ER_WARN_DEPRECATED_TIMESTAMP_DEFAULT_NULL
Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev