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answer duplicate key value violates unique constraint "django_admin_log_pkey"

related duplicate key value violates unique constraint "django_migrations_pkey"

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how to add unique key constraint in mysql

Exception has occurred: IntegrityError UNIQUE constraint failed: tablename.id

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there is no unique constraint matching given keys for referenced table

django.db.utils.integrityerror: unique constraint failed:

ERROR: duplicate key value violates unique constraint statuslogs_pkey DETAIL: Key (id)=(1621) already exists.

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psycopg2.errors.UniqueViolation: duplicate key value violates unique constraint ""

Cannot insert duplicate key in object 'dbo.Instructor'. The duplicate key value is (2).

Cannot insert duplicate key in object 'dbo.Instructor'. The duplicate key value is (2).

duplicate key value violates unique constraint "pg_type_typname_nsp_index"

duplicate value unique constraint mysql error