Question

与问题BigQuery combine tables based on closest timerstamp and matching value类似

我有三个表格，每行表格 numberTwo 我需要在表格 numberOne 中获得具有相同提示 > cod 值，以及那些在比较 time1 和 time2 时具有最近时间的值。如果表 numberOne 中未显示 cod ，则会尝试将提示与表中的 cod 相匹配numberThree

为了更容易理解我需要做的是：

表编号1：

|  id |  cod  |   hint  |           time1         |
---------------------------------------------------
|  1  |  ABC  |    V    | 2016-11-03 18:00:00 UTC |
|  2  |  ABC  |    W    | 2016-11-03 12:00:00 UTC |
|  3  |  CDE  |    X    | 2016-11-03 19:00:00 UTC |
|  4  |  CDE  |    Y    | 2016-11-03 19:30:00 UTC |
|  5  |  EFG  |    Z    | 2016-11-03 18:00:00 UTC |

表格编号

|  id |  cod  |   value  |         time2           |
----------------------------------------------------
|  1  |  ABC  |   xyz2   | 2016-11-03 18:20:00 UTC |
|  2  |  FHK  |   h323   | 2016-11-03 11:30:00 UTC |
|  3  |  ABC  |   rewq   | 2016-11-03 09:00:00 UTC |
|  4  |  IJK  |   abce   | 2016-11-03 19:10:00 UTC |

表号码<3>

|  id |  cod  |   hint   |
--------------------------
|  1  |  FHK  |   tes1   |
|  2  |  IJK  |   tes2   |
|  3  |  MNK  |   tes3   |
|  4  |  MOP  |   tes4   |

因此，对于表 numberTwo 的第1行，我会得到表 numberOne 中的所有行 cod：ABC

|  1  |  ABC  |    V    | 2016-11-03 18:00:00 UTC |
|  2  |  ABC  |    W    | 2016-11-03 12:00:00 UTC |

在这些之间，我会从 time2 获得最接近时间戳的那个：

|  1  |  ABC  |    V    | 2016-11-03 18:00:00 UTC |

如果表 numberOne 中未显示 cod ，则它与表 numberThree 匹配。 numberOne 和 numberThree 中的代码是唯一的。因此，在任何情况下都不会在两个表中显示相同的代码。因此，它可以首先尝试匹配表 numberThree 。

处理完每一行后，我会有一个这样的表：

所需表格

|  id |  cod  |   hint  |   value  |         time2           |
--------------------------------------------------------------
|  1  |  ABC  |    V    |   xyz2   | 2016-11-03 18:20:00 UTC |
|  2  |  FHK  |   tes1  |   h323   |                         |
|  3  |  ABC  |    W    |   rewq   | 2016-11-03 09:00:00 UTC |
|  4  |  IJK  |   tes2  |   abce   |                         |

Answer 1

尝试以下

WITH 
/*
TableNumberOne AS (
  SELECT 1 AS id, 'ABC' AS cod, 'V' AS hint, TIMESTAMP '2016-11-03 18:00:00 UTC' AS time1 UNION ALL
  SELECT 2 AS id, 'ABC' AS cod, 'W' AS hint, TIMESTAMP '2016-11-03 12:00:00 UTC' AS time1 UNION ALL
  SELECT 3 AS id, 'CDE' AS cod, 'X' AS hint, TIMESTAMP '2016-11-03 19:00:00 UTC' AS time1 UNION ALL
  SELECT 4 AS id, 'CDE' AS cod, 'Y' AS hint, TIMESTAMP '2016-11-03 19:30:00 UTC' AS time1 UNION ALL
  SELECT 5 AS id, 'EFG' AS cod, 'Z' AS hint, TIMESTAMP '2016-11-03 18:00:00 UTC' AS time1 
),
TableNumberTwo AS (
  SELECT 1 AS id, 'ABC' AS cod, 'xyz2' AS value, TIMESTAMP '2016-11-03 18:20:00 UTC' AS time2 UNION ALL
  SELECT 2 AS id, 'FHK' AS cod, 'h323' AS value, TIMESTAMP '2016-11-03 11:30:00 UTC' AS time2 UNION ALL
  SELECT 3 AS id, 'ABC' AS cod, 'rewq' AS value, TIMESTAMP '2016-11-03 09:00:00 UTC' AS time2 UNION ALL
  SELECT 4 AS id, 'IJK' AS cod, 'abce' AS value, TIMESTAMP '2016-11-03 19:10:00 UTC' AS time2 
),
TableNumberThree AS (
  SELECT 1 AS id, 'FHK' AS cod, 'test1' AS hint UNION ALL
  SELECT 2 AS id, 'IJK' AS cod, 'test2' AS hint UNION ALL
  SELECT 3 AS id, 'MNK' AS cod, 'test3' AS hint UNION ALL
  SELECT 4 AS id, 'MOP' AS cod, 'test4' AS hint 
),
*/
tempTable AS (
  SELECT 
    t2.id, t2.cod, t2.value, t2.time2, t1.hint, 
    ROW_NUMBER() OVER(PARTITION BY t2.id, t2.cod, t2.value 
                      ORDER BY ABS(TIMESTAMP_DIFF(t2.time2, t1.time1, SECOND))) AS win
  FROM TableNumberTwo AS t2
  LEFT JOIN TableNumberOne AS t1
  ON t1.cod = t2.cod
)
SELECT 
  t1.id, t1.cod, IFNULL(t1.hint, t2.hint) AS hint, value, 
  IF(t1.hint IS NULL, NULL, time2) as time2
FROM tempTable AS t1
LEFT JOIN TableNumberThree AS t2
ON t1.cod = t2.cod AND t1.hint IS NULL
WHERE win = 1

BigQuery - 根据匹配值或时间戳组合三个表

1 个答案: