<p>MySQL raises ER_PARTITION_SUBPART_MIX_ERROR when a CREATE TABLE or ALTER TABLE statement mixes partitions that have subpartitions with partitions that do not.</p>
<p>MySQL Error 1483 (ER_PARTITION_SUBPART_MIX_ERROR) occurs when only some partitions define subpartitions. Add identical SUBPARTITION clauses to every PARTITION, or drop subpartitioning entirely, and the statement will execute successfully.</p>
Must define subpartitions on all partitions if on one
The error message "Must define subpartitions on all partitions if on one" signals that a CREATE TABLE or ALTER TABLE statement attempted to mix plain partitions with sub-partitioned ones. MySQL demands complete symmetry: if one partition is subdivided, every partition must be subdivided the same way.
The error originates from the partitioning engine during DDL parsing. It stops execution to prevent inconsistent metadata that would make the partition map ambiguous for the optimizer and storage engine.
The error fires at compile time, not runtime. You will see it immediately after issuing a DDL that defines partitions. It affects MySQL versions 5.1 and onward wherever partitioning is enabled.
It most often arises during incremental schema changes, such as adding a new partition template, converting existing partitions to subpartitions, or copying sample code written for a different version.
Ignoring the error prevents the table from being created or altered, blocking deployments and blocking write traffic if wrapped inside a migration. Consistent partition definitions are also critical for predictable query routing and performance.
The root cause is partition inconsistency. MySQL requires each PARTITION clause to contain an identical SUBPARTITION specification when subpartitioning is used.
Using a PARTITION BY RANGE definition for the first partition and a PARTITION BY RANGE with SUBPARTITION for the next will always raise error 1483.
Rewrite the DDL so that every partition lists a SUBPARTITION clause, or remove all subpartition references. Keep the number of subpartitions and their naming scheme identical across partitions.
After adjusting the syntax, rerun the CREATE TABLE or ALTER TABLE command. The statement should execute without errors.
Adding subpartitions to an existing table: first convert the entire table to the new partition syntax using ALTER TABLE ... REORGANIZE PARTITION to redefine each partition with subpartitions.
Copy-pasted sample code: ensure the sample matches your target MySQL version and adjust subpartition counts to be uniform.
Define partition templates using PARTITION BY ... SUBPARTITION syntax so that future partitions inherit consistent subpartitioning.
Automate partition maintenance scripts to generate the full partition plus subpartition block, removing the chance of human omission.
ER_PARTITION_CONST_DOMAIN_ERROR: Occurs when RANGE values overlap; verify boundary values.
ER_PARTITION_WRONG_NO_PART_ERROR: Triggers when partition count is zero; ensure at least one partition.
ER_ROW_DOES_NOT_MATCH_PARTITION: Runtime error for wrongly routed inserts; validate your partitioning keys.
A developer adds SUBPARTITION definitions to the first partition only, forgetting the rest.
Legacy code uses plain RANGE partitions while new code introduces HASH subpartitions in the same statement.
An ALTER TABLE tries to add a subpartitioned partition to a previously non-subpartitioned table without reorganizing existing partitions.
Syntax generated for MySQL 8.0 is run on MySQL 5.7, where partition syntax rules differ slightly, causing inconsistency.
Appears when partition range values overlap or are out of order.
Raised during INSERT when row values do not map to any partition.
Triggered when partition count is zero or negative in a CREATE or ALTER statement.
No. Every partition must have the exact same number of subpartitions and naming convention.
Yes. Any partitioned table that uses subpartitioning must keep the definition identical, regardless of RANGE, LIST, or HASH.
MySQL halts DDL and leaves the schema unchanged. You must rewrite the statement manually or with a migration tool.
Galaxy highlights partition syntax inconsistencies in real time and supplies AI-generated corrections, reducing the likelihood of committing invalid DDL.
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