Why Can't I Add or Update a Child Row in My Database? (1452 Error)

Database integrity constraint conflict: Cannot add or update Zixing

In the relational database, integrity constraints are often encountered. One of the errors is "1452 cannot be added or updated", which is related to the restraint of the external key.

What is the external key constraint?

The outer key constraints defines the relationship between the two tables, ensuring that the value in the sub -table is consistent with the corresponding value in the parent table. This helps maintain data integrity and prevent inconsistent. Error message

In this example, the error message indicates that you try to insert the value into the

column of the table, which references the column of the

table. However, the value you try to insert (50dc845A-83E4-4DB3-8705-5432AE7AEE3) does not exist in the

table. comments project_id Solution: Make sure effective parental relationships projects id projects To solve this problem, verify whether the

value in the table is in the

column of the table. These values ​​must be matched to maintain the definition of the external key relationship. In this example, please update the value in the table as the valid value existing in the

columns of the

table, or create a new bank with the corresponding project details in the comments table in the table Essence project_id projects Once the correct relationship is established, you should be able to successfully insert the data into the id table without any complete constraint conflict. comments

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