SQL "NOT IN" 函数无法正常工作

Question

嗨，谁能找出这个 sql 查询有什么问题。 Not In 功能无法正常工作。在我的 table 中，id 1 和 2 不应该被获取，因为它们在 not in 函数中进入子查询。

select pr.id
     ,pc.title as category
     ,pc.points_required
     ,pc.total_leads_allowed
     ,pr.leadsSold
     ,pr.created 
  from ad_pro_requests pr 
  join ad_pro_categories pc 
   on pc.id = pr.cat_id 
 where pr.cat_id IN(1,2)
    AND pr.id NOT IN(
        select request_id 
        from ad_purchased_leads 
        where user_id = 8
    ) 
   And pr.leadsSold < pc.total_leads_allowed 
   And pc.active =1 
   And pr.status = 1 
   And pr.placeId = 'CA' 
    OR pr.placeId = 6077243 
ORDER by id desc 
limit 0,15

Answer 1

您很可能需要用括号将 OR 条件括起来：

where 
    pr.cat_id in (1, 2)
    and pr.id not in (...)
    and ...
    and (pr.placeid = 'CA' or pr.placeid = '6077243')

或者更好的是，使用 in:

where 
    pr.cat_id in (1, 2)
    and pr.id not in (...)
    and ...
    and pr.placeid in ('CA', '6077243')

请注意，我用单引号将文字数字括起来，因为 placeid 似乎是一个字符串。

我还建议将 in 条件重写为 not exists。它通常更有效，并且 null-safe:

where 
    pr.cat_id in (1, 2)
    and not exists (
        select 1
        from ad_purchased_leads apl
        where apl.user_id = 8 and apl.request_id = pr.id
    )
    and pr.leadsSold < pc.total_leads_allowed 
    and pc.active =1 
    and pr.status = 1
    and pr.placeid in ('CA', '6077243')

为了性能，您需要 ad_purchased_leads(user_id, request_id) 上的索引。

Answer 2

OR 的优先级低于 AND。您的 WHERE 转换为

where (
    pr.cat_id IN(1,2)
        AND pr.id NOT IN(
            select request_id 
            from ad_purchased_leads 
            where user_id = 8
        ) 
       And pr.leadsSold < pc.total_leads_allowed 
       And pc.active =1 
       And pr.status = 1 
       And pr.placeId = 'CA'
) OR (pr.placeId = 6077243)

你可能想要

where pr.cat_id IN(1,2)
    AND pr.id NOT IN(
        select request_id 
        from ad_purchased_leads 
        where user_id = 8
    ) 
   And pr.leadsSold < pc.total_leads_allowed 
   And pc.active =1 
   And pr.status = 1 
   And (pr.placeId = 'CA' OR pr.placeId = 6077243)

SQL "NOT IN" 函数无法正常工作

SQL "NOT IN" function not working properly

mysql

sql

subquery

where-clause

sql-in