检查不同其他列中每行的值是不是相同

Posted 2023-05-08

【中文标题】检查不同其他列中每行的值是不是相同

【英文标题】：Check if values are the same for each row over criteria in different other columns检查不同其他列中每行的值是否相同

【发布时间】：2021-12-30 11:33:13

【问题描述】：

DB-Fiddle

CREATE TABLE campaigns 
(
    id SERIAL PRIMARY KEY,
    campaign VARCHAR,
    supplier VARCHAR,
    plan_quantity DECIMAL
);

INSERT INTO campaigns (campaign, supplier, plan_quantity)
VALUES ('C001', 'supplier_a', '500'),
       ('C001', 'supplier_a', '500'),
       ('C001', 'supplier_b', '500'),

       ('C002', 'supplier_a', '600'),
       ('C002', 'supplier_b', '700'),
    
       ('C003', 'supplier_c', '100'),
       ('C003', 'supplier_c', '100'),
  
       ('C004', 'supplier_a', '900'),
       ('C004', 'supplier_c', '800'),
       ('C004', 'supplier_d', '250'),
       ('C004', 'supplier_d', '250'),

       ('C005', 'supplier_b', '380'),
       ('C005', 'supplier_b', '270'),
       ('C005', 'supplier_d', '590');

预期结果：

campaign  |   supplier   |   plan_quantity   |      check         |
----------|--------------|-------------------|--------------------|-------
  C001    |  supplier_a  |        500        |       same         |
  C001    |  supplier_a  |        500        |       same         |
  C001    |  supplier_b  |        500        |    non-relevant    |
----------|--------------|-------------------|--------------------|-------
  C002    |  supplier_a  |        600        |    non-relevant    |
  C002    |  supplier_b  |        700        |    non-relevant    | 
----------|--------------|-------------------|--------------------|-------
  C003    |  supplier_c  |        100        |       same         |
  C003    |  supplier_c  |        100        |       same         |
----------|--------------|-------------------|--------------------|-------
  C004    |  supplier_a  |        900        |    non-relevant    |
  C004    |  supplier_c  |        800        |    non-relevant    |
  C004    |  supplier_d  |        250        |       same         |
  C004    |  supplier_d  |        250        |       same         |
----------|--------------|-------------------|--------------------|-------
  C005    |  supplier_b  |        380        |     different      |
  C005    |  supplier_b  |        270        |     different      |
  C005    |  supplier_d  |        590        |    non-relevant    |

如果供应商在每个广告系列中出现多次，我想在check 列中查看该供应商的plan_quantity 是否在每一行中都相同。

当我从this question修改查询时，我已经接近结果了：

SELECT
    campaign AS campaign,
    supplier AS supplier,
    plan_quantity AS plan_quantity,
    (CASE 
         WHEN MIN(plan_quantity) OVER (PARTITION BY supplier, campaign) = MAX(plan_quantity) OVER (PARTITION BY supplier, campaign) 
             THEN 'same' 
             ELSE 'different' 
     END) AS check
 FROM
     campaigns
 ORDER BY 
     1, 2, 3;

但是，我不知道如何添加与查询无关的描述，以防供应商在每个广告系列中没有出现多次。

你有什么想法吗？

【参考方案1】：

您可以使用附加的 case 表达式 稍微修改查询，以便检查何时 same 并指示任何计数为 1 的内容不相关：

select 
  campaign,
  supplier,
  plan_quantity, 
  case when 
      Min(plan_quantity) over(partition by campaign, supplier) 
        = Max(plan_quantity) over(partition by campaign, supplier) 
    then 
        case when Count(*) over(partition by campaign, supplier) = 1 
         then 'non-relevant' else 'same' 
        end
    else 'different'
    end as Check
from campaigns
order by 1,2,3;

【讨论】：

仅用于我的文档：dbfiddle.uk/…