dev/benchmarking/ddl/1_09_table_public_unit.sql

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  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
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-- UNIT
CREATE TABLE IF NOT EXISTS public.unit
(
  unit_id SERIAL PRIMARY KEY
  , units citext NOT NULL UNIQUE
  , benchmark_type_id integer NOT NULL
  , FOREIGN KEY (benchmark_type_id)
    REFERENCES public.benchmark_type(benchmark_type_id)
);
COMMENT ON TABLE public.unit IS 'The actual units for a reported benchmark.';
COMMENT ON COLUMN public.unit.units
  IS 'For example: nanoseconds, microseconds, bytes, megabytes.';

-- CONSTRAINTS
ALTER TABLE public.unit
  ADD CONSTRAINT unit_check_units_string_length
  CHECK (char_length(units) < 63);