使用WHERE和和SQL

Question

我试图运行此查询

select from_ from uploaded_emails1 
where uploaded_emails1.from_ != 'test@email_domain.com' 
and uploaded_emails1.from_ not in candidate_emails1.email 

但我得到的错误No such table candidate_emails1.email。但是，如果我运行select email from candidate_emails1它运行良好。

我在做什么错？

Answer 1

别名candidate_emails1是不是在你的SQL

定义尝试

select from_ from uploaded_emails1 
where uploaded_emails1.from_ != 'test@email_domain.com' 
and uploaded_emails1.from_ not in(select emails from candidate_emails1) 

Answer 2

尝试：

SELECT from_ FROM uploaded_emails1, candidate_emails1 
WHERE uploaded_emails1.from_ != 'test@email_domain.com' 
AND uploaded_emails1.from_ != candidate_emails1.email 

Answer 3

有两种方法可以做到这一点，方法是使用NOT IN条款或NOT EXISTS条款：

SELECT 
    from_ 
FROM uploaded_emails1 
WHERE uploaded_emails1.from_ != 'test@email_domain.com' 
AND NOT EXISTS (
    SELECT * 
    FROM candidate_emails1 
    WHERE candidate_emails1.email = uploaded_emails1.from_ 
); 

......或者......

SELECT 
    from_ 
FROM uploaded_emails1 
WHERE uploaded_emails1.from_ != 'test@email_domain.com' 
AND uploaded_emails1.from_ NOT IN (
    SELECT email 
    FROM candidate_emails1 
);