<p>The error appears when the declared precision M for FLOAT(M,D), DOUBLE(M,D), or DECIMAL(M,D) is smaller than the scale D, making the numeric type impossible.</p>
<p>MySQL Error 1427 ER_M_BIGGER_THAN_D occurs when a numeric column is declared with precision (M) smaller than its scale (D). Ensure M is equal to or greater than D, then recreate or alter the column definition to resolve the issue.</p>
For float(M,D), double(M,D) or decimal(M,D), M must be
MySQL raises error 1427 with the message For float(M,D), double(M,D) or decimal(M,D), M must be >= D whenever a numeric column is defined where the total digits M are fewer than the digits after the decimal point D.
The server stops the statement to protect data consistency because such a definition cannot store any value. Correcting it is vital to get the schema compiled and to prevent application outages.
The error surfaces when developers mistype numeric definitions, copy code from other databases, or generate schemas programmatically without validating precision and scale.
It also arises during ALTER TABLE operations that increase scale without adjusting precision or inside stored routine parameters declared with invalid pairs.
Inspect every FLOAT(M,D), DOUBLE(M,D), and DECIMAL(M,D) declaration. Make sure M is at least D. Adjust one of the values, then rerun CREATE TABLE or ALTER TABLE. The command will succeed and the column will accept data.
For migrations, update the generator or conversion script to enforce the rule automatically.
Importing schemas from PostgreSQL often yields NUMERIC definitions such as DECIMAL(4,6). Change them to DECIMAL(6,4) or higher.
Analysts declaring DECIMAL(2,4) for percentages should use DECIMAL(6,4) so that two digits can exist before the decimal point.
Create a numeric type guideline that lists approved precision and scale pairs.
Integrate schema linting in CI. Galaxy users can enable pre commit validation inside the editor to catch ER_M_BIGGER_THAN_D before code lands in the main branch.
Error 1064 signals general SQL syntax issues; review parentheses and commas.
Error 1406 appears when inserted values exceed declared precision; increase M or reduce data size.
Writing DECIMAL(4,6) or FLOAT(5,8) triggers the error because 4 or 5 is smaller than 6 or 8.
Tools converting PostgreSQL or SQL Server schemas may output invalid precision scale combinations for MySQL.
Using ALTER TABLE to widen scale without raising precision, such as DECIMAL(8,10), produces ER_M_BIGGER_THAN_D.
Occurs when an inserted value exceeds declared decimal precision; adjust M or the data.
Raised when a numeric value is outside the permitted range, often after precision changes.
Indicates invalid numeric input format such as 12,34 when strict SQL mode is on.
It is a compile-time error that appears during CREATE TABLE, ALTER TABLE, or stored routine compilation.
Yes. MySQL allows M and D to be equal, which leaves no digits before the decimal but is still valid.
Yes. UNSIGNED affects sign storage only; precision and scale rules stay the same.
Galaxy highlights schema errors in the editor and can run a pre-commit check so invalid numeric definitions never reach production.
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