Answers for "Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`mydb`.`course`, CONSTRAINT `fk_course_department1` FOREIGN KEY (`department_id`) REFERENCES `department` (`department_id`))"

mysql error 1452

SELECT child_table.* 
FROM child_table 
LEFT JOIN parent_table 
  ON parent_table.referenced_column = child_table.referencing_column 
WHERE parent_table.referenced_column IS NULL


-- Delete all data from output of that query

Posted by: Guest on August-28-2020

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Answers for "Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`mydb`.`course`, CONSTRAINT `fk_course_department1` FOREIGN KEY (`department_id`) REFERENCES `department` (`department_id`))"

Code answers related to "Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`mydb`.`course`, CONSTRAINT `fk_course_department1` FOREIGN KEY (`department_id`) REFERENCES `department` (`department_id`))"

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Answers for "Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`mydb`.`course`, CONSTRAINT `fk_course_department1` FOREIGN KEY (`department_id`) REFERENCES `department` (`department_id`))"

Code answers related to "Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`mydb`.`course`, CONSTRAINT `fk_course_department1` FOREIGN KEY (`department_id`) REFERENCES `department` (`department_id`))"

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