![]() Therefore, we correct the customers to use the key that really exists on the table. We cross-check and see if the customer is trying to reference a nonexistent key on the target table. While entering the MySQL commands it is necessary to enter the right command. Lastly, running the right command fixed the error. ALTER TABLE child ADD FOREIGN KEY (parentid) REFERENCES parent(id) ALTER TABLE child ADD FOREIGN KEY (parentid) REFERENCES `parent`(`id`) Īlso, it can be without quotes as below. We corrected the command and provided the right one below. ALTER TABLE child ADD FOREIGN KEY (parentid) REFERENCES `parent(id)` Here is an example, where our customer used the quotes incorrectly in the command and ran into problems. We check all the details like the quotes in the command used as well. We also confirm if our customers are running the right command. Check if there are any in-appropriate quotes So we changed the storage engine using the command: ALTER TABLE parent ENGINE=INNODB ģ. SHOW CREATE TABLE parentĪs a result, we found that the storage engine was not InnoDB. We further continued to investigate by checking the storage engine set to the database table. Check if the parent table is using InnoDB We found that the table was available to create the constraint,Ģ. Our Support Engineers started troubleshooting the error by checking if the table is available. ![]() Let’s see how our Support Engineers fix this error. We have now discussed the different causes of this error message. Again, if the Primary key or Foreign Key is varchar, we always make sure that the collation is the same for both. If there are any typo errors while running the command then the final result will end into an error. A typo in the local key and foreign tableĪll the details in both the local key and foreign tables must have the same variables. Thus, it is really important to avoid any syntax errors while executing MySQL queries.Ĥ. This will run into problems and finally end up with a MySQL error 1215. Normally, while running commands to alter the tables wrong quotes will be provided. In-appropriate quotes to the tables in constraints Ideally, our Support Engineers suggest customers make sure of using InnoDB as the engine on all tables in the database.ģ. We use the below command to change the storage engine of the tables in case if there is any change required. And then we can set it to InnoDB if it not set. So it is necessary to check the engine of the table. If the storage engine of the parent table is not InnoDB then also it will throw errors. Through this, we can confirm if the tables are available or not. So its advisable to check the available tables in the database using the command: show tables However, there will be no hint given that the table doesn’t exist. ![]() Sometimes, the database table to which customers try to add constraints doesn’t exist. Let’s now check out few causes that our Database Experts usually see in databases. There can be many causes for this error to occur. He was trying to create a relational database table with 3 primary keys. ![]() Recently one of our customers reported a MySQL error. Let’s have a first look at the MySQL error 1215. Today, let’s see what causes MySQL error 1215 and how our Support Engineers fix it. There are many reasons for this error to occur which include in-appropriate quotes in the constraints, missing table, parent table doesn’t use InnoDB and many more.Īt Bobcares, we receive requests on MySQL errors as a part of our Server Management Services. Usually, MySQL error 1215 pops up while creating a foreign key or constraints in the database table. Databases operations like backup or restore often result in annoying errors.
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