<p>Error 1734 occurs when a statement refers to a PARTITION of a table that is subpartitioned; MySQL expects a SUBPARTITION clause instead.</p>
<p>MySQL Error 1734: ER_PARTITION_INSTEAD_OF_SUBPARTITION means you addressed a subpartitioned table with a PARTITION clause. Switch to SUBPARTITION, or refer to the partitioned parent table. Updating your ALTER, SELECT, or INSERT statement with the correct subpartition name resolves the issue.</p>
Subpartitioned table, use subpartition instead of
Error 1734 fires when you try to reference a specific PARTITION in a table that is actually partitioned and subpartitioned. Because the table includes a second level of partitioning, MySQL demands the SUBPARTITION keyword to address individual pieces of data.
The error text is: "Subpartitioned table, use subpartition instead of partition". It appears in DDL or DML that cites a PARTITION clause, for example in ALTER TABLE, SELECT, INSERT, UPDATE, DELETE, or EXCHANGE PARTITION statements.
The condition arises only on tables that combine partitioning and subpartitioning. If a query, maintenance command, or MySQL utility refers to PARTITION p1 while the table actually stores data in SUBPARTITION p1_s1, the server rejects the request with code 1734 and SQLSTATE HY000.
Developers commonly meet the problem during schema migrations, data archiving jobs, or when moving data between identical schemas where one table uses only partitions and the counterpart uses both levels.
Using the PARTITION keyword on a table that includes SUBPARTITION definitions is the primary trigger. MySQL interprets the clause as an attempt to address a non-existent top-level partition.
Copy-pasted maintenance scripts, ORMs that generate generic partition clauses, and manual typos often introduce the mismatch. Version upgrades that alter partition layouts can also leave outdated automation referring to PARTITION rather than SUBPARTITION.
Update the statement so it references SUBPARTITION parts directly or remove the clause entirely when you intend to affect the whole table. Check the output of SHOW CREATE TABLE to locate correct subpartition names before writing the clause.
If you really want to target the parent partition level, redesign the table to use only one level of partitioning. Otherwise, always specify both PARTITION p and SUBPARTITION sp, or only SUBPARTITION sp, depending on the statement type.
In ALTER TABLE EXCHANGE PARTITION workflows, replace PARTITION p1 with SUBPARTITION p1_s1. For SELECT statements extracting historical data, swap partition(p1) with subpartition(p1_s1) or remove the clause to query all data.
During data export with mysqldump, use the --no-data flag first to confirm partition definitions, then adjust your dump query to reference subpartitions to avoid error 1734.
Maintain a single authoritative schema definition in version control and regenerate maintenance scripts after any change to partitioning. Rely on dynamic SQL that pulls subpartition names via INFORMATION_SCHEMA.PARTITIONS rather than hard-coding them.
Galaxy’s context-aware AI copilot inspects SHOW CREATE TABLE results in real time, suggesting SUBPARTITION clauses when your table is two-level partitioned, preventing code 1734 before execution.
MySQL Error 1733 (ER_SUBPARTITION_NOT_EXIST) triggers when the named subpartition is missing. Error 1503 (ER_PARTITION_CONST_DOMAIN_ERROR) appears when partitioning expressions are invalid. These issues share root causes in mis-managed partition metadata and are fixed by aligning SQL with actual table definitions.
Scripts that hard-code PARTITION p1 for tables later converted to use subpartitions immediately fail.
Developers migrating code between schemas often forget the second partition layer and leave outdated PARTITION references.
Some tools always emit PARTITION clauses without checking INFORMATION_SCHEMA, leading to mismatch on subpartitioned tables.
Mistyping SUBPARTITION as PARTITION during quick hotfixes generates the error.
Raised when the named subpartition cannot be found. Verify names in INFORMATION_SCHEMA.PARTITIONS.
Occurs when partition expression values fall outside the allowed domain. Adjust RANGE or LIST expressions.
Triggers when a CREATE TABLE mixes partitioning and subpartitioning incorrectly. Ensure consistent strategy.
Because the table is two-level partitioned, addressing only PARTITION is ambiguous. MySQL demands the more specific SUBPARTITION keyword.
Yes. Simply omit both PARTITION and SUBPARTITION clauses. MySQL then scans the entire table, though performance may drop.
Query INFORMATION_SCHEMA.PARTITIONS or run SHOW CREATE TABLE to see each subpartition name.
Galaxy’s AI copilot reviews the table definition and suggests the correct SUBPARTITION syntax, preventing the mistake before the query runs.
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