<p>Error 1652 occurs when the same column is listed more than once in a PARTITION BY clause during CREATE TABLE or ALTER TABLE.</p>
<p>MySQL Error 1652: ER_SAME_NAME_PARTITION_FIELD signals that a column appears more than once in the PARTITION BY clause, generating the message Duplicate partition field name. Remove or rename the duplicate column in the partition definition to resolve the problem.</p>
Duplicate partition field name '%s'
Error 1652 fires when MySQL detects the same column referenced multiple times in a PARTITION BY clause. The server stops statement execution and returns Duplicate partition field name.
The error appears in CREATE TABLE, ALTER TABLE ... PARTITION BY, and CREATE TABLE ... LIKE combined with partitioning. It protects the optimizer from ambiguous partition metadata.
The primary trigger is listing an identical column twice inside the partitioning expression list or sub-partition definition. MySQL requires each partitioning key column to be unique.
The error can also surface when a generated column duplicates another column name or when a typo causes two columns to resolve to the same identifier after case folding.
Inspect the PARTITION BY clause and remove repeated column names. If you need both columns, rename one of them or redesign the partitioning scheme.
After correcting the definition, rerun the CREATE or ALTER statement. The table will be created or modified successfully.
During table modifications engineers often copy partition definitions from existing tables, accidentally leaving a duplicate column. Verifying the list before execution prevents the error.
Generated columns that mirror base columns can introduce hidden duplicates. Exclude the generated column from partition keys or drop it.
Always run SHOW CREATE TABLE before copying a partition spec. Review the key list for duplicates.
Add automated schema linting in CI to flag repeated partition columns. Galaxy's SQL editor surfaces lint warnings inline, catching mistakes early.
Error 1503 (ER_PARTITION_FIELD_ERROR) indicates a non-indexed partition key. Ensure all partition columns are part of the primary key for InnoDB tables.
Error 1502 (ER_PARTITION_CONST_DOMAIN_ERROR) arises when a partition value is out of range. Check RANGE definitions to fix.
The same physical column name is repeated in the partitioning key list.
A generated column duplicates the name of a base column when referenced in PARTITION BY.
Developers clone partition specs from other tables and forget to remove redundant fields.
MySQL treats identifiers case-insensitively on most platforms, so Col_A and col_a collide.
Raised when a partition column is not part of every unique key. Add the column to the primary key.
Occurs when a literal in a RANGE partition is outside the allowed domain. Correct the value list.
Triggered when an illegal function is used in a partitioning expression. Replace with an allowed deterministic function.
No. MySQL blocks statement execution until the duplicate partition field is removed or renamed.
No. Error 1652 is enforced at the SQL layer and applies to all partition-capable engines such as InnoDB and NDB.
Galaxy's real-time linting flags duplicate identifiers inside PARTITION BY clauses and suggests one-click fixes before you run the query.
Partitioning works best with minimal unique keys. Removing duplicates simplifies metadata and can improve pruning efficiency.
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