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Description

This error occurs when an attempt to insert or update data into a MySQL table fails because the data violates a `CHECK` constraint. `CHECK` constraints are rules defined on columns to ensure that data values meet specific conditions, enforcing data integrity and preventing invalid data entries.

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Error Message

Check constraint '%s' is violated.

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Known Causes

4 known causes

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Invalid Data Input

Data provided for an `INSERT` or `UPDATE` operation does not meet the criteria specified by a `CHECK` constraint (e.g., out of a defined range, incorrect format).

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Misunderstood Constraint Rules

The application or user attempting the data modification is unaware of or incorrectly interprets the specific conditions enforced by the `CHECK` constraint.

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Application Logic Flaw

A bug in the application code allows or generates data that violates the database's `CHECK` constraints, despite intended validation processes.

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Data Migration Incompatibility

Importing or migrating data from a source system that does not adhere to the target database's newly established `CHECK` constraints.

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Solutions

3 solutions available

1. Identify and Correct Data Violating the Constraint medium

Find the specific data causing the check constraint violation and modify it.

1

Determine the exact check constraint name mentioned in the error message. The error message will typically look like: `ERROR 3819 (HY000): Check constraint '%s' is violated.` Replace '%s' with the actual constraint name.

SELECT CONSTRAINT_NAME, CHECK_CLAUSE FROM INFORMATION_SCHEMA.CHECK_CONSTRAINTS WHERE CONSTRAINT_NAME = 'your_constraint_name';

2

Analyze the `CHECK_CLAUSE` to understand the rule that is being broken. This clause defines the condition that data must satisfy.

3

Query the table to find rows that violate this condition. You'll need to translate the `CHECK_CLAUSE` into a `WHERE` clause for your `SELECT` statement. For example, if the clause is `(quantity > 0)`, you'd look for `(quantity <= 0)`.

SELECT * FROM your_table WHERE NOT (your_check_condition);

4

Update or delete the violating rows to comply with the check constraint. Be cautious and ensure the new data is valid.

UPDATE your_table SET column_name = new_valid_value WHERE primary_key_column = violating_row_id;
-- OR
DELETE FROM your_table WHERE primary_key_column = violating_row_id;

2. Temporarily Disable and Re-enable the Check Constraint easy

Disable the constraint to allow data modification, then re-enable it after data is corrected.

1

Identify the name of the table and the check constraint that is causing the violation. The error message will usually provide the constraint name.

2

Disable the check constraint. This will allow `INSERT` and `UPDATE` statements to proceed without checking the constraint.

ALTER TABLE your_table DISABLE CONSTRAINT your_constraint_name;

3

Perform your data modification operations (e.g., `INSERT`, `UPDATE`, `DELETE`) that were previously failing. Once these operations are complete, re-enable the constraint.

ALTER TABLE your_table ENABLE CONSTRAINT your_constraint_name;

4

After re-enabling, it's a good practice to verify that all data now conforms to the constraint. If any violations persist, the `ENABLE CONSTRAINT` operation might fail, or you might encounter the same error again.

3. Modify or Remove the Check Constraint medium

Adjust the check constraint's logic or remove it entirely if it's no longer needed or incorrectly defined.

1

Identify the name of the check constraint and the table it belongs to. You can use `SHOW CREATE TABLE your_table;` to see all constraints.

SHOW CREATE TABLE your_table;

2

If the constraint is incorrect, you can modify it. This involves dropping the existing constraint and creating a new one with the corrected logic.

ALTER TABLE your_table DROP CONSTRAINT your_constraint_name;
ALTER TABLE your_table ADD CONSTRAINT your_constraint_name CHECK (your_new_condition);

3

If the constraint is no longer required, you can drop it completely. Be certain that removing the constraint will not lead to data integrity issues.

ALTER TABLE your_table DROP CONSTRAINT your_constraint_name;

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Related Errors

5 related errors

MySQL Error 3819: Check Constraint Violation