检查记录的序列包含一个特定值

Question

我想找到没有序列中的特定值的记录：

客户表：

举例来说，我需要找到所有没有“F值”的客户。

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

也将返回值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可以在这里使用。

你的NOT IN语句需要看起来像这样。

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;