<p>MySQL raises this error when a partition definition supplies more than one constant where only a single value is permitted.</p>
<p>MySQL Error 1657: ER_TOO_MANY_VALUES_ERROR appears when a RANGE or LIST partition clause lists multiple constants for a column that expects one. Edit the VALUES clause so each partition contains only one literal to resolve the error.</p>
Cannot have more than one value for this type of %s
MySQL throws error 1657, condition ER_TOO_MANY_VALUES_ERROR, when a partition definition provides more than one literal value for a single partition column. The storage engine cannot determine a unique boundary, so the CREATE or ALTER TABLE statement fails.
The message usually reads: Cannot have more than one value for this type of partitioning. It stops table creation or modification until the VALUES clause is corrected.
The RANGE and LIST partitioning syntaxes expect one constant per partition column. Supplying a tuple such as VALUES LESS THAN (10,20) or VALUES IN (1,2) for a single-column partition breaks that rule and triggers the error.
The error can also appear if the number of constants does not match the number of columns in PARTITION BY RANGE COLUMNS or LIST COLUMNS definitions.
Check each PARTITION definition. Ensure that a single-column partition uses exactly one literal in its VALUES clause and that multi-column partitions contain the same number of constants as columns.
After adjusting the VALUES list, rerun the CREATE or ALTER statement. MySQL will accept the corrected partition boundaries.
Developers often copy sample code for multi-column RANGE COLUMNS tables and forget to switch to RANGE on one column, leaving two constants. Replacing the pair with a single boundary eliminates the error.
Another scenario is LIST partitioning meant to group multiple discrete keys. Convert to PARTITION BY LIST COLUMNS(a,b) when listing pairs, or break the list into separate partitions.
Always count partition columns before writing VALUES clauses. Adopt naming conventions such as p_lt_100 to remind future maintainers of the single bound.
Automated SQL linters in editors like Galaxy highlight mismatched constant counts at write time, preventing the error from reaching production.
Error 1492 partitions must be defined for each LIST value appears when a value is missing rather than duplicated. Validate coverage to resolve.
Error 1493 only constant expressions are allowed surfaces when dynamic expressions are used. Replace expressions with literals to fix.
Using VALUES LESS THAN (10,20) on a PARTITION BY RANGE(a) table supplies two constants, triggering error 1657.
Specifying VALUES IN (1,2) for a single-column LIST partition violates rule of one constant per partition boundary.
When using PARTITION BY LIST COLUMNS (a,b) but defining VALUES IN (1) MySQL raises the error because the constant count differs from column count.
Raised when a LIST partition set does not cover every defined value.
Occurs when non-constant expressions appear in partition definitions.
Appears when subpartition clauses conflict with the main partitioning type.
Yes. Declare PARTITION BY RANGE COLUMNS or LIST COLUMNS with the same number of columns as the constants supplied for each partition.
Error 1657 exists from MySQL 5.1 through 8.0 and the rule about constant counts has not changed.
No. The error stems from partition syntax rules and is unaffected by sql_mode settings.
Galaxy's SQL editor highlights mismatched VALUES list lengths in real time and its AI copilot suggests corrected partition definitions.
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