<p>MySQL error 1482 occurs when a table definition includes subpartitions that are not HASH or KEY based.</p>
<p>MySQL Error 1482: ER_PARTITION_SUBPARTITION_ERROR signals that subpartitions must use HASH or KEY partitioning. Remove unsupported subpartition types or convert them to HASH or KEY to resolve the issue.</p>
Subpartitions can only be hash partitions and by key
Error 1482 appears when you try to create or alter a table with subpartitions that are not of type HASH or KEY. MySQL enforces that subpartitions can only be defined with these two algorithms.
The full message "Subpartitions can only be hash partitions and by key" indicates a mismatch between the chosen subpartition method and MySQLs partitioning rules.
The main trigger is specifying RANGE or LIST subpartitioning under a primary partitioning scheme. MySQL currently limits subpartition algorithms to HASH and KEY to maintain predictable data placement.
Another common cause is using PARTITION BY HASH combined with SUBPARTITION BY RANGE, which is also disallowed.
Redefine your subpartitions as HASH or KEY, or eliminate the subpartition layer entirely. Review storage requirements and pick the simplest structure that meets performance goals.
After adjusting the CREATE TABLE or ALTER TABLE statement, rerun it to verify the correction.
Developers often copy examples from other databases that support RANGE subpartitioning. Convert these examples to HASH or remove subpartitions.
Legacy scripts written for earlier MySQL versions may now fail. Update those scripts to comply with current partitioning limitations.
Always consult the MySQL Partitioning documentation before designing complex partition layouts. Prototype designs in a test schema.
Use Galaxy’s schema-aware AI copilot to flag unsupported partition combinations before deployment.
Errors like ER_WRONG_PARTITION_NAME or ER_PARTITION_FUNCTION_NOT_ALLOWED often surface in the same workflow. Understanding their distinctions helps accelerate troubleshooting.
Using RANGE or LIST inside SUBPARTITION BY causes the error because only HASH and KEY are allowed.
Combining PARTITION BY HASH with SUBPARTITION BY RANGE violates syntactic rules and triggers error 1482.
Scripts migrated from other databases or outdated tutorials might contain unsupported subpartition definitions.
Upgrading MySQL may expose previously ignored subpartition mismatches, leading to this error on table reload.
Raised when a partition name does not match naming rules.
Occurs when a partitioning function is not permitted for the chosen partition type.
Thrown when duplicate partition names are defined in the same table.
Appears when attempting to drop a partition that does not exist.
No. MySQL only allows HASH and KEY algorithms for subpartitioning.
No. The subpartition layer must also be HASH or KEY.
Not always. Evaluate query patterns and maintenance overhead before adding subpartitions.
Galaxy’s AI copilot checks CREATE TABLE statements in real time and warns about unsupported partition combinations.
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