Get Instant Solutions for Kubernetes, Databases, Docker and more
When encountering the error "1218: Cannot delete child row" in MySQL, it typically indicates a foreign key constraint violation, meaning you're trying to delete a record from a parent table that has dependent records in a child table. Here are actionable steps:
- Run the following query to find the foreign key constraint that is causing the issue. Replace `yourtablename` with the name of the table you're trying to delete from.SELECT CONSTRAINT
NAME, TABLE
NAME, COLUMN
NAME, REFERENCED
TABLE
NAME, REFERENCED
COLUMN_NAME
FROM INFORMATIONSCHEMA.KEY
COLUMN_USAGE
WHERE TABLESCHEMA = 'your
database
name' AND TABLE
NAME = 'your
table
name';
- Use the information from step 1 to identify the child table and its related column. Then, check for dependent rows that are preventing the delete operation. For example, if your foreign key is in `childtable` and references a column in `parenttable`, you would run:SELECT * FROM child
table WHERE foreign
key
column = 'value
that
you
tried
to
delete';
- Based on your application's requirements, you may either:
- Delete the dependent rows: Execute a delete statement on the child table to remove the dependent rows. For example:DELETE FROM child
table WHERE foreign
key
column = 'value
that
you
tried
to
delete';
- Update the dependent rows: If deleting is not an option, you may need to update the foreign key column in the child table to point to a different parent record or set it to `NULL` if the foreign key constraint allows it. Example:UPDATE child
table SET foreign
key
column = 'new
value
or
NULL' WHERE foreign
key
column = 'value
that
you
tried
to_delete';
- After resolving the dependent rows issue, try to execute your delete operation again on the parent table.
Remember to replace `yourdatabasename`, `yourtablename`, `childtable`, `foreignkeycolumn`, `valuethatyoutriedtodelete`, and `newvalueor_NULL` with the actual values applicable to your scenario.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)
Get Instant Solutions for Kubernetes, Databases, Docker and more
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Block quote
Ordered list
Unordered list
Bold text
Emphasis
Superscript
Subscript
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)