How to Resolve 'Cannot Add or Update Child Row: Integrity Constraint Violation'?

Solution "Can't add or update sub -line: Potal constraints conflict" error

When inserting the data in a table containing the outer key constraints, the conflict error may be encountered. This error message indicates that due to the failure of external keys, it cannot be added or updated.

For example, try to insert a line to the

table, the table has the outer key constraint of the

table. The error occurred because the value you inserted in does not exist in the comments table. projects project_id To solve this problem, please make sure that the value you inserted for projects is in the

table. This means that you must first create a row with the corresponding ID value in the

table before you can insert it into the project_id table. projects projects The following is an example of operation: comments

By ensuring the corresponding records in the parent table, this error can be avoided. Please check your data and make sure that the ID value referenced by the outer key already exists in the parent table.

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