Question

当前，我正在尝试将4个表连接在一起，仅显示5列，并将它们全部合并到一个表中。

这是查询：

SELECT
  id,
  platform,
  url,
  profileImageUrl,
  name
FROM (
  SELECT
    f.id AS id,
    f.platform AS platform,
    f.url AS url,
    f.profileImageUrl AS profileImageUrl,
    f.name AS name
  FROM
    `l.p.link_f_main` AS f UNION
  SELECT
    i.id AS id,
    i.platform AS platform,
    i.url AS url,
    i.profilePicture AS profileImageUrl,
    i.fullName AS name
  FROM
    `l.p.link_i_main` AS i UNION
  SELECT
    t.id AS id,
    t.platform AS platform,
    t.url AS url,
    t.profileImageUrl AS profileImageUrl,
    t.name AS name
  FROM
    `l.p.link_t_main` AS t UNION
  SELECT
    y.id AS id,
    y.platform AS platform,
    y.url AS url,
    y.profileImageUrl AS profileImageUrl,
    y.name AS name
  FROM
    `l.p.link_y_main` AS y ) as main

这是错误：

Error: Syntax error: Expected keyword ALL or keyword DISTINCT but got keyword SELECT at [16:3]

我做错了什么？

Answer 1

答案：

1）对于大查询，必须使用UNION ALL而不是UNION

2）所有联合列的数据类型应该相同。 -

我遇到一个问题，列中的一个是STRING-INT64, INT64, INT64, STRING
因此，我也将其余列更改为STRING，以使其正常工作。

Answer 2

摘自文档：UNION { ALL | DISTINCT }。因此，您必须使用UNION ALL或UNION DISTINCT（这正是错误消息所说的）。正如HoneyBadger用户提到的那样，这是正确的解释。

BigQuery，联盟问题/错误：语法错误：预期关键字ALL或关键字DISTINCT，但关键字SELECT的位置为[16：3]

2 个答案: