按最后查询日期统计 BigQuery 表存储

-- Find stale tables sorted by last query date with storage cost

DECLARE lookback_days INT64 DEFAULT 30;

-- US multi-region pricing ($/GiB/month)
DECLARE logical_active_price NUMERIC DEFAULT 0.02;
DECLARE logical_longterm_price NUMERIC DEFAULT 0.01;
DECLARE physical_active_price NUMERIC DEFAULT 0.04;
DECLARE physical_longterm_price NUMERIC DEFAULT 0.02;

WITH last_access AS (
  SELECT
    ref.project_id, ref.dataset_id, ref.table_id,
    MAX(j.creation_time) AS last_query_at
  FROM `your-project`.`region-us`.INFORMATION_SCHEMA.JOBS_BY_PROJECT j,
    UNNEST(j.referenced_tables) ref
  WHERE j.state = 'DONE' AND j.job_type = 'QUERY'
    AND j.creation_time >= TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL lookback_days DAY)
  GROUP BY 1, 2, 3
),
storage_info AS (
  SELECT
    s.project_id,
    s.table_schema AS dataset_id,
    s.table_name AS table_id,
    IFNULL(opt.option_value, 'LOGICAL') AS model,
    IF(opt.option_value = 'PHYSICAL', s.total_physical_bytes, s.total_logical_bytes) AS size_bytes,
    IF(opt.option_value = 'PHYSICAL', s.active_physical_bytes, s.active_logical_bytes) AS active_bytes,
    IF(opt.option_value = 'PHYSICAL', s.long_term_physical_bytes, s.long_term_logical_bytes) AS lt_bytes
  FROM `your-project`.`region-us`.INFORMATION_SCHEMA.TABLE_STORAGE s
...