检查记录序列是否包含特定值

Question

我正在尝试查找序列中没有特定值的记录：

客户表：

例如，我需要找到所有没有＆＃34;价值F＆＃34;记录在案。

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

也会返回值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声明需要看起来像这样。

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;