大查询 - 水平连接字符串

Question

我有一个数据，其中有一列是名字，一列是姓氏。我尝试通过代码将它们组合成一列：

SELECT GROUP_CONCAT_UNQUOTED(full_name,' ') 
from (Select first_name as check from [DATA]), 
     (select last_name  as check from [DATA])

但它 returns 一个单行字符串

Anna Alex Emma Sean .... Miller Smith White ...

但我想要的实际上是像

这样的专栏

Anna Miller
Alex Smith
Emma White
...

你能告诉我我应该做些什么吗？谢谢！

Answer 1

您需要使用 CONCAT 和 trim 函数

SELECT CONCAT(rtrim(ltrim(first_name)),' ',rtrim(ltrim(last_name))) AS full_name
FROM
  (SELECT 'Anna' AS first_name,
          ' Miller ' AS last_name),

Answer 2

您还可以使用双竖线 || 连接运算符连接字符串 (see here for more info):

select 
    trim(first_name) || ' ' || trim(last_name)
from
    ...

大查询 - 水平连接字符串

Big query - Concatenate strings horizontally

string-concatenation

google-bigquery