Question

我有一个查询

select department_id,SUM(quantity) as Quantity,sales_report.date as Date from sales_report where date = '2018-10-04' GROUP BY department_id , Date ORDER BY department_id ASC;

这给了我如下输出：

id  quantity    date
1   204       2018-10-04
2   88        2018-10-04
3   135       2018-10-04
4   72        2018-10-04
5   391       2018-10-04
6   134       2018-10-04
7   386       2018-10-04
8   421       2018-10-04
9   292       2018-10-04
10  86        2018-10-04
11  83        2018-10-04
12  34        2018-10-04
13  3435      2018-10-04

但是我需要这样的数据：

id          1   2   3   4   5   6   7   8   9   10  11  12  13
2018-10-04  204 88  135 72  391 134 386 421 292 86  83  34  3435

任何人都可以帮助我实现这一目标。

Answer 1

您可以尝试以下操作：

  select sales_report.date, 
  sum(case when id=1 then quantity else 0 end) as '1',
  sum(case when id=2 then quantity else 0 end) as '2',
  sum(case when id=3 then quantity else 0 end) as '3',
  sum(case when id=4 then quantity else 0 end) as '4',
  sum(case when id=5 then quantity else 0 end) as '5',
  sum(case when id=6 then quantity else 0 end) as '6',
  sum(case when id=7 then quantity else 0 end) as '7',
  sum(case when id=8 then quantity else 0 end) as '8',
  sum(case when id=9 then quantity else 0 end) as '9',
  sum(case when id=10 then quantity else 0 end) as '10',
  sum(case when id=11 then quantity else 0 end) as '11',
  sum(case when id=12 then quantity else 0 end) as '12',
  sum(case when id=13 then quantity else 0 end) as '13'
  from sales_report where date = '2018-10-04' GROUP BY Date ORDER BY date ASC

Answer 2

您需要在从输出数据集中进行数据透视的情况下

   select date, max(case when id=1 then quantity end) as 1_one,
   max(case when id=2 then quantity end) as 2_one,
   max(case when id=3 then quantity end) as 3_one,
   max(case when id=4 then quantity end) as 4_one,
   max(case when id=5 then quantity end) as 5_one,
   max(case when id=6 then quantity end) as 7_one,
   max(case when id=7 then quantity end) as 7_one,

    max(case when id=10 then quantity  end) as 10_ten from t
    group by date

PostgreSQL将行转置为列

2 个答案: