sql group by （在postgres中可以运行）-CFANZ编程社区

WITH Sales AS (
  SELECT 123 AS sku, 1 AS day, 9.99 AS price UNION ALL
  SELECT 123, 1, 8.99 UNION ALL
  SELECT 456, 1, 4.56 UNION ALL
  SELECT 123, 2, 9.99 UNION ALL
  SELECT 789, 3, 1.00 UNION ALL
  SELECT 456, 3, 4.25 UNION ALL
  SELECT 789, 3, 0.99
)
SELECT
  day,
  SUM(price) AS total
FROM Sales
GROUP BY day;

sql group by （在postgres中可以运行）_Sales

WITH Sales AS (
  SELECT 123 AS sku, 1 AS day, 9.99 AS price UNION ALL
  SELECT 123, 1, 8.99 UNION ALL
  SELECT 456, 1, 4.56 UNION ALL
  SELECT 123, 2, 9.99 UNION ALL
  SELECT 789, 3, 1.00 UNION ALL
  SELECT 456, 3, 4.25 UNION ALL
  SELECT 789, 3, 0.99
)
SELECT
  sku,
  day,
  SUM(price) AS total
FROM Sales
GROUP BY sku, day
ORDER BY sku, day;

sku | day | total 
-----+-----+-------
 123 |   1 | 18.98
 123 |   2 |  9.99
 456 |   1 |  4.56
 456 |   3 |  4.25
 789 |   3 |  1.99
(5 rows)