是否可以在不嵌套在 FROM 中的情況下重寫此 SQL 查詢

Question

SELECT id, 
       COUNT(*)
FROM (
  SELECT DISTINCT id, 
                  value
  FROM tablename 
  WHERE column  = 'some filter'
)
GROUP BY 1
HAVING COUNT(*) > 1

我嘗試使用自連接，但無法獲得相同的輸出。

Answer 1

我想你想要：

SELECT id, COUNT(DISTINCT value)
FROM tablename 
WHERE column  = 'some filter'
GROUP BY 1
HAVING COUNT(DISTINCT value) > 1;