1762
MariaDBERRORNotableForeign KeysHIGH confidence
Foreign key constraint violation — no child table info available
Production Risk
Medium — operation rejected.
What this means
A foreign key violation occurred but MySQL could not determine child table details, often due to an internal lookup failure.
Why it happens
- 1FK violation during bulk data load where child table metadata is not cached.
- 2Internal InnoDB FK check failure without full context.
How to reproduce
trigger — this will error
trigger — this will error
-- Variant of FK violation where child info is unavailable internally
expected output
ERROR 1762 (23000): Foreign key constraint fails.
Fix
Identify and remove referencing child rows manually
Identify and remove referencing child rows manually
SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_NAME = 'parent_table';
Why this works
Lists all child tables referencing the parent so you can clean them up.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1762 ER_FOREIGN_DUPLICATE_KEY_WITHOUT_CHILD_INFO
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