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Need help to make a trigger in SQL server to display error message if the user inputs a ID that does not exist

Shammikit
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im making a hospital database and i need to make a trigger to the department table.the doctor id is a foreign key in department table. if the user inputs a Doctor ID to the department table that does not exist in doctor table, a trigger should execute and display a error message. can someone please help me to get this running.Thank you

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Posted

you dont need a trigger. you just need to request if the id exists after the value has been entered

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