Question

我有表A ，其中一列City看起来像这样（前10行）：

城市

    Torrance
    San Carlos
    San Jose
    Walnut Creek
    Carmichael
    Anderson
    Altadena
    Orange
    Palos Verdes Estates

和表B ，其中一列名称是这样的（前10行）：

名称

    Merrill
    Elm
    Blossom Hill
    Brandywine
    Altamont
    Hill
    Wapello
    Palmyra
    Via Almar

我需要获取一个新的表C ，其中包含2列城市和名称从表A的前1,000行和表B的前1,000行开始。

结果表应如下所示（前10行）：

城市 ................................. ... 名称

Torrance                Merrill
San Carlos              Elm
San Jose                Blossom Hill
Walnut Creek            Brandywine
Carmichael              Altamont
Anderson                Hill
Altadena                Wapello
Orange                  Palmyra
Palos Verdes Estates    Via Almar

问题是如何水平连接每个表的前1,000行？

Answer 1

以下是BigQuery标准SQL的内容（另请参见您问题下方的我的评论）

#standardSQL
SELECT City, Name FROM (
  SELECT City, ROW_NUMBER() OVER() pos 
  FROM `project.dataset.tableA` LIMIT 1000
) a JOIN (
  SELECT Name, ROW_NUMBER() OVER() pos 
  FROM `project.dataset.tableB` LIMIT 1000
) b USING(pos)

如果要应用到您的问题中的示例数据，如下面的示例

#standardSQL
WITH `project.dataset.tableA` AS (
  SELECT 'Torrance' City UNION ALL
  SELECT 'San Carlos' UNION ALL
  SELECT 'San Jose' UNION ALL
  SELECT 'Walnut Creek' UNION ALL
  SELECT 'Carmichael' UNION ALL
  SELECT 'Anderson' UNION ALL
  SELECT 'Altadena' UNION ALL
  SELECT 'Orange' UNION ALL
  SELECT 'Palos Verdes Estates' 
), `project.dataset.tableB` AS (
  SELECT 'Merrill' Name UNION ALL
  SELECT 'Elm' UNION ALL
  SELECT 'Blossom Hill' UNION ALL
  SELECT 'Brandywine' UNION ALL
  SELECT 'Altamont' UNION ALL
  SELECT 'Hill' UNION ALL
  SELECT 'Wapello' UNION ALL
  SELECT 'Palmyra' UNION ALL
  SELECT 'Via Almar' 
)
SELECT City, Name FROM (
  SELECT City, ROW_NUMBER() OVER() pos 
  FROM `project.dataset.tableA` LIMIT 1000
) a JOIN (
  SELECT Name, ROW_NUMBER() OVER() pos 
  FROM `project.dataset.tableB` LIMIT 1000
) b USING(pos)

结果是

Row City                    Name     
1   Torrance                Merrill  
2   San Carlos              Elm  
3   San Jose                Blossom Hill     
4   Walnut Creek            Brandywine   
5   Carmichael              Altamont     
6   Anderson                Hill     
7   Altadena                Wapello  
8   Orange                  Palmyra  
9   Palos Verdes Estates    Via Almar

如何水平连接不同表中的列？

1 个答案: