標準SQL：將顯式交叉連接重寫為WITH子句

考慮一個transactions有兩個 JSONB 欄位outputs和inputs. 問題是如何使用 WITH 子句重寫此查詢？

-- Note: This query will process 111.85 MB when run.
SELECT
    transactions.hash AS CREATED_TX_HASH,
    transactions.block_number AS CREATED_BLOCK_ID,
    transactions.block_timestamp AS CREATED_BLOCK_TIME,
    outputs.index AS CREATED_INDEX,
    outputs.value / 1e8 AS OUTPUT_VALUE_BTC,
    transactions.hash AS SPENT_CREATED_TX_HASH,
    transactions.block_number AS SPENDING_BLOCK_ID,
    transactions.block_timestamp AS SPENDING_BLOCK_TIME,
    inputs.index AS SPENT_CREATED_INDEX,
    inputs.spent_transaction_hash as SPENDING_TX_HASH,
    inputs.spent_output_index AS SPENDING_INDEX,
    inputs.value / 1e8 AS INPUT_VALUE_BTC
FROM `bigquery-public-data.crypto_bitcoin.transactions` as transactions
CROSS JOIN
    transactions.outputs as outputs
CROSS JOIN
    transactions.inputs as inputs
-- FROM `bigquery-public-data.crypto_bitcoin.transactions` as transactions,
--     transactions.outputs as outputs,
--     transactions.inputs as inputs   
WHERE transactions.block_timestamp_month < '2009-02-01' 
ORDER BY 3

我需要創建 CTE 以保留臨時結果集，如下所示：

WITH outputs AS (
  SELECT
      transactions.hash AS CREATED_TX_HASH,
      transactions.block_number AS CREATED_BLOCK_ID,
      transactions.block_timestamp AS CREATED_BLOCK_TIME,
      outputs.index AS CREATED_INDEX,
      outputs.value / 1e8 AS OUTPUT_VALUE_BTC
  FROM `bigquery-public-data.crypto_bitcoin.transactions` as transactions,
      transactions.outputs as outputs
  WHERE transactions.block_timestamp_month < '2009-02-01'  

), inputs AS (

  SELECT
    transactions.hash AS SPENT_CREATED_TX_HASH,
    transactions.block_number AS SPENDING_BLOCK_ID,
    transactions.block_timestamp AS SPENDING_BLOCK_TIME,
    inputs.index AS SPENT_CREATED_INDEX,
    inputs.spent_transaction_hash as SPENDING_TX_HASH,
    inputs.spent_output_index AS SPENDING_INDEX,
    inputs.value / 1e8 AS INPUT_VALUE_BTC
  FROM `bigquery-public-data.crypto_bitcoin.transactions` as transactions,
      transactions.inputs as inputs
  WHERE transactions.block_timestamp_month < '2009-02-01'
)

但我不知道這SELECT兩個 CTE 上的哪個陳述句產生與上面的原始查詢相同的結果。

uj5u.com熱心網友回復：

您需要通過CREATED_BLOCK_ID和加入它們SPENDING_BLOCK_ID，此外，我使用該ROW_NUMBER陳述句來避免重復值。

下面的查詢應該適合你：

    WITH outputs AS (
  SELECT
      transactions.hash AS CREATED_TX_HASH,
      transactions.block_number AS CREATED_BLOCK_ID,
      transactions.block_timestamp AS CREATED_BLOCK_TIME,
      outputs.index AS CREATED_INDEX,
      outputs.value / 1e8 AS OUTPUT_VALUE_BTC
  FROM `bigquery-public-data.crypto_bitcoin.transactions` as transactions,
      transactions.outputs as outputs
  WHERE transactions.block_timestamp_month < '2009-02-01'  

), inputs AS (

  SELECT
    transactions.hash AS SPENT_CREATED_TX_HASH,
    transactions.block_number AS SPENDING_BLOCK_ID,
    transactions.block_timestamp AS SPENDING_BLOCK_TIME,
    inputs.index AS SPENT_CREATED_INDEX,
    inputs.spent_transaction_hash as SPENDING_TX_HASH,
    inputs.spent_output_index AS SPENDING_INDEX,
    inputs.value / 1e8 AS INPUT_VALUE_BTC
  FROM `bigquery-public-data.crypto_bitcoin.transactions` as transactions,
      transactions.inputs as inputs
  WHERE transactions.block_timestamp_month < '2009-02-01'
)
SELECT * from 
(
  SELECT * , 
  ROW_NUMBER() OVER(PARTITION BY CREATED_BLOCK_ID, CREATED_INDEX, SPENDING_BLOCK_ID, SPENT_CREATED_INDEX, CREATED_TX_HASH, SPENT_CREATED_TX_HASH
                    ORDER BY CREATED_BLOCK_TIME DESC) as last
   from outputs o join inputs i 
on  o.CREATED_BLOCK_ID=SPENDING_BLOCK_ID 
order by o.CREATED_BLOCK_ID, o.CREATED_BLOCK_TIME, o.CREATED_INDEX, o.CREATED_TX_HASH  
)
WHERE last = 1 AND CREATED_TX_HASH = SPENT_CREATED_TX_HASH

輸出如下所示：

最后，我建議您使用CROSS JOIN查詢，因為此函式比使用子查詢的子查詢具有更好的性能WITH。

標籤：sql 加入 谷歌大查询 公共表表达式 比特币

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