Automatically generated SQL for renaming single-column unique constraints

rename-unique.sql

SELECT
  constraint_type,
  tc.constraint_name,
  tc.table_name,
  kcu.column_name,
  format('ALTER TABLE "%s" RENAME CONSTRAINT %s TO unq_%s_%s;',
         tc.table_name, tc.constraint_name, tc.table_name, kcu.column_name)
FROM
  information_schema.table_constraints AS tc
  JOIN information_schema.key_column_usage AS kcu
    ON tc.constraint_name = kcu.constraint_name
WHERE constraint_type = 'UNIQUE'
      AND tc.constraint_name like 'uk\_%'