How to fix MySQL 4116 Foreign key column is also a partition column?

Use separate columns for FK and partitioning: Redesign the schema so the partition key column is not used in any FK constraint.

Remove partitioning if FKs are required: If the FK relationship is critical, removing partitioning allows FK creation.

4116

MySQLERRORNotableHIGH confidence

Foreign key column is also a partition column

Production Risk

Low — DDL fails; no data is affected.

Why it happens

1An attempt was made to create a FK on a column that is also used in the PARTITION BY expression.
2A partitioned table had a FK added that includes the partition key column.

Fix 1

Use separate columns for FK and partitioning

Why this works

Redesign the schema so the partition key column is not used in any FK constraint.

Fix 2

Remove partitioning if FKs are required

ALTER TABLE t REMOVE PARTITIONING;

Why this works

If the FK relationship is critical, removing partitioning allows FK creation.

What not to do

Sources

MySQL 8.0 — 4116 ER_FK_COLUMN_IN_PARTITION_FIELD

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At a glance

PlatformMySQL Error Numbers

Code4116

SeverityERROR

TierNotable

ConfidenceHIGH