Here are some handy troubleshooting tips to help you resolve MySQL foreign key constraint is incorrectly formed error. Our MySQL Support team is here to lend a hand with your queries and issues.

MySQL foreign key constraint is incorrectly formed | Resolved

If you have been running into this error, you are in the right place. Our experts have put together several troubleshooting tips to help you resolve this error in a jiffy:

• First, verify the foreign key column and the referenced column are the same data type.
• Check if the reference column is set as primary_key. If not, then ensure it is INDEXED. Referenced columns must be indexed in both the parent and child tables.
• Referenced columns must be indexed in both the parent and child tables.
• Next, check if there are duplicate values in referenced columns.
• The maximum length of the referenced columns has to be equal to or less than the foreign key’s maximum length.
• If any referenced column or table names are reserved words in MySQL, we have to surround them with backticks (`) in the SQL statement.
• Finally, verify the syntax of the foreign key definition.

Let us know in the comments which one of the above troubleshooting tips helped you resolve the MySQL foreign key constraint is incorrectly formed error.

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Conclusion

To sum up, our Support Engineers demonstrated how to resolve the “foreign key constraint is incorrectly formed” error.