How To Fix Integrity Constraint Violation Error In SQL Database
Fixing "Integrity constraint violation" error in SQL databases: Declare new column as nullable or use data migration job to fill valid IDs before adding foreign key constraint.
If you are dealing with the error: "Integrity constraint violation: Cannot add or update a child row: a foreign key constraint fails", you are in the right article.
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Usually you encounter this error when you add a new column to a table and declare it as a Foreign Key.
In a SQL database, a foreign key is a field in a table used to establish a link between the data in another table. Consider the customers table below.
CREATE TABLE customers (
id INT PRIMARY KEY,
name VARCHAR(255),...