Question

例如我有一个查询：

select item_name, day, month, year from some_table;

但是我希望结果表是2列，而不是4，就像那样：

[商品名称] [日期（dd.mm.YYYY）]

我们可以这样做吗？

我使用Google的Biq Query标准SQL。

Answer 1

以下是BigQuery Standard SQL

#standardSQL
SELECT item_name, DATE(year, month, day) AS date
FROM `yourTable`

您可以使用以下虚拟数据进行测试/播放

#standardSQL
WITH `yourTable` AS (
  SELECT 'abc' AS item_name, 5 AS day, 10 AS month, 2017 AS year UNION ALL
  SELECT 'xyz', 1, 9, 2017
)
SELECT item_name, DATE(year, month, day) AS date
FROM `yourTable`

Answer 2

使用此查询

select item_name, CONCAT(cast(day as STRING)) ,'.' ,cast(month as STRING), '.',cast(year as STRING)) as Date

Answer 3

您可以使用 CONCAT

<强>查询

select item_name, concat(day, '.', month, '.', year) as date
from some_table;

如果列是整数类型，则必须将其强制转换为字符串。

select item_name,
concat(cast(day as string), '.', cast(month as string), '.', cast(year as string)) as date
from some_table;

无论如何，当显示结果时，是否有连接选择查询列？

3 个答案: