檢查記錄的序列包含一個特定值

Question

我想找到沒有序列中的特定值的記錄：

客戶表：

舉例來說，我需要找到所有沒有「F值」的客戶。

SELECT * FROM Customer 
WHERE VALUE NOT IN 'Value F' 

也將返回值A，B，C等

Answer 1

SELECT * 
FROM Customer c 
WHERE NOT EXISTS (SELECT 1 
        FROM Customer c2 
        WHERE c2.CustomerID = c.CustomerID 
          AND VALUE = 'Value F') 

NOT EXISTS可以在這裏使用。

你的NOT IN語句需要看起來像這樣。

SELECT * 
FROM Customer 
WHERE CustomerId NOT IN (SELECT CustomerID 
          FROM  Customer 
          WHERE VALUE = 'Value F') 

Answer 2

使用group by和having：

select customerid 
from customers 
group by customerid 
having sum(case when value = 'Value F' then 1 else 0 end) = 0;