在mysql中查询执行not in function

Question

我在mysql中编写了一个查询来过滤掉这些供应商＆＃39;它们不在userid = 1的vendorids中，但它们存在于userid = 5的vendorids中，但我没有得到正确的答案，查询在下面

select vendorid  
from rating_table 
where (userid = 5) not in (select vendorid from rating_table where userid = 1)  
order by vendorid asc;

谢谢

Answer 1

您需要检查子查询结果中是否不存在vendorid

SELECT vendorid 
FROM rating_table 
WHERE (userid = 5)
AND vendorid NOT IN 
(
    SELECT 
        vendorid 
    FROM rating_table 
    WHERE userid = 1
) 
ORDER BY vendorid ASC;