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insert into production.brands (brand_id, brand_name)
values ('12', 'reddy');

What I have tried:

insert into production.brands (brand_id, brand_name)
values ('12', 'reddy');
Updated 15-Jun-22 9:34am

This error is because you are trying to insert a record with a key of 12 when a record already exists in the table with a key of 12.
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The error is pretty explicit: you are trying to enter a row containing a value in the Primary Key column which is already in a different row.

Primary keys must be unique: you cannot have any duplicates under any circumstances.
Whatever you are trying to do, you probably need to rethink your whole design.
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