mysql - SQL Error 1452: Cannot add or update child row -

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I am trying to add an existing key to a foreign key named OrderSubbl. I've added a new column called Approved, like: 

  Alternate table is not countless by ORDERTBL ADD approved BIGINT; After that, I tried to set it as a foreign key:  
  Add an optional table order. Approved Accepted Foreign Next Key (Accepted) Records Employee Employee (Employee);  
 
 but I continue 
 
 
 Error 1452: hair row can not be added or updated 
 
 
 What am i doing Should I set the field as  accepted  instead of the foreign key?

While defining

order table order TBL is approved by BIGINT Not countless;

then can not be accepted can not be null . The default value will be set which is 0 .

Then you apply a foreign key to employee TB . This means that the DB checks that accepted has only those values ​​which are in the employeeby . But that is not the case. The value is 0 .

Allow either null to accepted and set the value to the value later or set the correct value before adding the foreign key.


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