mysql - 如何在mysql中的IN子句中添加额外的值

Question

我有一个 In 子句，里面有查询。我想在那个 IN 中添加“NULL”。我该如何添加。

这是我的查询

WHERE `e`.`lead_id` IN (
    select lds.lead_id 
        from mortgage_lead_leads lds 
        where lds.loan_officer_id=60
)

这给出了 10 条记录。我想在该 In 子句中添加另一条记录。谁能帮我吗。

Answer 1

您无需将其添加到 IN 列表中：

WHERE (`e`.`lead_id` IN (select lds.lead_id from mortgage_lead_leads lds
                         where lds.loan_officer_id=60)
       OR `e`.`lead_id` is null)

请注意括号 - 如果您要添加另一个“AND 条件”语句可能很重要......

Answer 2

您可以使用带有 select null from dual 的 unio

  WHERE `e`.`lead_id` IN 
  (select lds.lead_id from mortgage_lead_leads lds 
    where lds.loan_officer_id=60 
    union 
   select null from dual )

or 一个 or 子句

   WHERE `e`.`lead_id` IN 
  (select lds.lead_id from mortgage_lead_leads lds 
    where lds.loan_officer_id=60 ) or `e`.`lead_id` is null