Question

我有两张桌子。每张表都包含1月至4月的公司利润。为简单起见，我在table1中使用了月份名称。

1）哪个表比另一个表好？

2）我希望从1月到4月找到每家公司的累积金额。

#standardSQL
with table1 as(
select "A" as comapany, 345 as Jan, 456 as Feb, 543 as March, 987 as April union all
select "B", 405, 956, 673, 907 union all
select "C", 745, 476, 323, 477
)
select * from table1

(or)

#standardSQL
with table2 as(
select  345 as A_profit, 456 as B_profit, 543 as C_profit,"1-31-2017" as year union all
select  405 , 956, 673,"2-28-2017" union all
select  745 , 476, 323,"3-31-2017" union all
select  515 , 736, 833,"4-30-2017"
)
select * from table2

Answer 1

哪个表比另一个好？

没有人是完美的甚至是好的：o（
以下是我建议支持具有动态公司数量和任意时间范围的大多数通用案例等但我可以承认，如果你只有很少的公司和非常具体的短时间框架 - 你可能会发现table1或table2中的任何一个都有用 - 但我怀疑它可能是一个实际的现实案例

#standardSQL
WITH table3 AS(
  SELECT "A" AS company, 345 AS profit, '1-31-2017' AS profit_date UNION ALL
  SELECT "A", 456, '2-28-2017' UNION ALL
  SELECT "A", 543, '3-31-2017' UNION ALL
  SELECT "A", 987, '4-30-2017' UNION ALL
  SELECT "B", 405, '1-31-2017' UNION ALL
  SELECT "B", 956, '2-28-2017' UNION ALL 
  SELECT "B", 673, '3-31-2017' UNION ALL 
  SELECT "B", 907, '4-30-2017' UNION ALL 
  SELECT "C", 745, '1-31-2017' UNION ALL 
  SELECT "C", 476, '2-28-2017' UNION ALL 
  SELECT "C", 323, '3-31-2017' UNION ALL 
  SELECT "C", 477, '4-30-2017' 
)

请注意 - 我不会更改此处的数据类型，并在原始示例中使用 - 日期为STRING

这将最终得到以下查询来获取

...... 1月至4月期间每家公司的累计金额

#standardSQL
SELECT company, SUM(profit) profit
FROM table3
WHERE PARSE_DATE('%m-%d-%Y', profit_date) 
  BETWEEN DATE '2017-01-01' AND DATE '2017-04-30' 
GROUP BY company

结果为

Row company profit   
1   A       2331     
2   B       2941     
3   C       2021

为了避免使用额外的解析字符串 - 您可以使用DATE类型，如下所示

#standardSQL
WITH table4 AS(
  SELECT "A" AS company, 345 AS profit, DATE '2017-01-31' AS profit_date UNION ALL
  SELECT "A", 456, DATE '2017-02-28' UNION ALL
  SELECT "A", 543, DATE '2017-03-31' UNION ALL
  SELECT "A", 987, DATE '2017-04-30' UNION ALL
  SELECT "B", 405, DATE '2017-01-31' UNION ALL
  SELECT "B", 956, DATE '2017-02-28' UNION ALL 
  SELECT "B", 673, DATE '2017-03-31' UNION ALL 
  SELECT "B", 907, DATE '2017-04-30' UNION ALL 
  SELECT "C", 745, DATE '2017-01-31' UNION ALL 
  SELECT "C", 476, DATE '2017-02-28' UNION ALL 
  SELECT "C", 323, DATE '2017-03-31' UNION ALL 
  SELECT "C", 477, DATE '2017-04-30' 
)
SELECT company, SUM(profit) profit
FROM table4
WHERE profit_date
  BETWEEN DATE '2017-01-01' AND DATE '2017-04-30' 
GROUP BY company

显然具有相同的结果

水平数据或垂直数据，这是BigQuery

1 个答案: