Google BigQuery CASE功能 [英] Google BigQuery CASE function

问题描述

我试图运行一个查询，像这里所回答的一样，
SQL选择多个总和？

  SELECT SUM（CASE WHEN order_date> = '01 / 01/09'THEN quantity ELSE 0 END ）AS items_sold_since_date，
 SUM（数量）AS items_sold_total，
 product_ID 
 FROM Sales 
 GROUP BY product_ID 
  

但是如果我尝试这样做，我会收到错误消息

 message ：无法识别的功能CASE。 
  

如果我尝试一个更简单的方法（从一个sql教程），

 选择案例1当1当'1'时2当'2'其他'更多'结束; 
  

然后我得到

 message：搜索的案例表达不支持：1.8  -  1.65。 
  

我将在黑暗中进行狂野刺杀，并假设SQL CASE函数是整体只是不支持BigQuery，但真的希望我错了，因为它会根据我想要运行的报表查询产生巨大的差异。

解决方案

更新：BigQuery支持CASE：

  SELECT CASE WHEN x = 1 then'one'when x = 2 THEN'two'ELSE'more'END 
 FROM（SELECT 1 AS x）
 
'one'
  

I'm trying to run a query like what's answered here, SQL Selecting multiple sums?

SELECT  SUM(CASE WHEN order_date >= '01/01/09' THEN quantity ELSE 0 END) AS items_sold_since_date,
    SUM(quantity) AS items_sold_total,
    product_ID
FROM    Sales
GROUP BY product_ID

But if I try that, I get the error message

"message": "Unrecognized function CASE".

If I try a much more simple (from an sql tutorial),

SELECT CASE 1 WHEN 1 THEN 'one' WHEN 2 THEN 'two' ELSE 'more' END;

I then get

"message": "searched case expression not supported at: 1.8 - 1.65".

I'm going to take a wild stab in the dark and assume that the SQL CASE function is overall just not supported on BigQuery, but really hope that I'm wrong because it makes a huge bit of difference based on the report queries I want to run.

解决方案

2013 update: BigQuery supports CASE:

SELECT CASE WHEN x=1 THEN 'one' WHEN x=2 THEN 'two' ELSE 'more' END 
FROM (SELECT 1 AS x) 

'one'

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