Question

DB-Fiddle

CREATE TABLE operations (
    id int auto_increment primary key,
    campaign VARCHAR(255),
    country VARCHAR(255),
    sales_status VARCHAR(255),
    quantity INT
);

INSERT INTO operations
(campaign, country, sales_status, quantity
)
VALUES 
("C001", "DE", "demand", "100"),
("C001", "US", "shipped", "300"),
("C001", "NL", "shipped", "700"),
("C001", "FR", "shipped", "400"),

("C002", "DE", "demand", "500"),
("C002", "US", "demand", "900"),
("C002", "FR", "shipped", "200"),

("C003", "US", "demand", "600"),
("C003", "NL", "demand", "250"),
("C003", "FR", "demand", "150"),
("C003", "PL", "demand", "550"),

("C004", "DE", "shipped", "825"),
("C004", "PL", "shipped", "462");

预期结果：

campaign    sales_status    SUM(quantity)
C001          shipped             1500
C002          shipped             1600
C003          demand              1550
C004          shipped             1287

在上面的结果中，我希望每个广告系列sales_status为shipped，以防每个广告系列存在至少一个国家/地区，其中sales_status是shipped。

例如，在广告系列C002中只有FR是shipped，因此结果C002应该在shipped中。

我尝试使用此查询：

SELECT
campaign,
(CASE WHEN MAX(sales_status = 'shipped') OVER (PARTITION BY campaign) = 1
THEN 'shipped' ELSE sales_status END) AS sales_status,
SUM(quantity)
FROM operations
GROUP BY 1;

但是，它不能给我正确的结果。
我需要进行哪些更改才能使其正常工作？

Answer 1

为什么不简单

SELECT
campaign,
MAX(sales_status) AS sales_status,
SUM(quantity)
FROM operations
GROUP BY 1;

？

如果可能还有其他sales_status值，则可以使用类似的

SELECT
campaign,
CASE WHEN SUM(sales_status = 'shipped') 
     THEN 'shipped'
     ELSE 'demand' 
     END AS sales_status,
SUM(quantity)
FROM operations
GROUP BY 1;

fiddle

Answer 2

有条件聚合：

SELECT 
  campaign,
  COALESCE(
    MAX(CASE WHEN sales_status = 'shipped' THEN sales_status END), 
    MAX(sales_status)
  ) sales_status,
  SUM(quantity) total
FROM operations
GROUP BY campaign;

或使用窗口功能FIRST_VALUE()和SUM()：

SELECT DISTINCT 
  campaign,
  FIRST_VALUE(sales_status) OVER (PARTITION BY campaign ORDER BY sales_status = 'shipped' DESC) sales_status,
  SUM(quantity) OVER (PARTITION BY campaign) total
FROM operations

请参见demo。
结果：

> campaign | sales_status | total
> :------- | :----------- | ----:
> C001     | shipped      |  1500
> C002     | shipped      |  1600
> C003     | demand       |  1550
> C004     | shipped      |  1287

如果每个值至少满足一个条件，则将一个值分配给所有其他值

2 个答案: