in table department i've class_id as f.k and in class table class_id as p.k
i want to update class_id in department table..
n getting error

It should only give you an error in the "department" table if the F/K does not exist in the "class" table.

What is the error text you are receiving?

Also, what is the specific action you are doing in the department table?

Can you please avoid convenient (for you) abbreviations? I assume f.k and p.k are foreign and primary keys. Also, some context would be nice. If you want help please do us the courtesy of providing as much information as you can. For example

1) how about some code for us to look at and a line number where the error occurs

2) how about an error number and description

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