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MySQL 1219: Cannot update child row.
When encountering the error "1219: Cannot update child row" in MySQL, it usually indicates a foreign key constraint failure. The immediate actions to take are:
- Identify the foreign key constraint causing the issue by running:
SHOW ENGINE INNODB STATUS;
Look under the `LATEST FOREIGN KEY ERROR` section for details on the failed constraint.
- Check the specific foreign key relationship and involved tables by executing:
SELECT TABLENAME, COLUMNNAME, CONSTRAINTNAME, REFERENCEDTABLENAME, REFERENCEDCOLUMN_NAME
FROM INFORMATIONSCHEMA.KEYCOLUMN_USAGE
WHERE TABLENAME = 'yourchildtablename';
Replace `'yourchildtable_name'` with the name of the table you are attempting to update.
- Verify the existence of the corresponding parent row in the referenced table by running a query like:
SELECT * FROM yourparenttable WHERE yourreferencedcolumn = 'valuenotfound';
Replace `yourparenttable`, `yourreferencedcolumn`, and `'valuenotfound'` with the appropriate table name, column name, and the value you're trying to insert/update in the child table, respectively.
- If the parent row does not exist, insert or update the necessary row in the parent table before retrying your original operation.
5. If the parent row exists, ensure the value you're trying to insert/update in the child table matches exactly, including case sensitivity and data type, with the parent table's corresponding value.
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