如果select语句为true，则插入mysql

Question

我有一个MySQL查询：

select count(id) as tot from user where sponsor_id=10006 and exp > now();

上述查询返回1为tot。

如果上述查询返回的值超过1，则应在表中插入记录。

Answer 1

你可以这样写：

insert into log
select 'there are more than one IDs'
from dual -- this is just a dummy table in mysql
where 1 <> (select count(id) as tot 
              from user 
             where sponsor_id=10006
               and exp > now()
           )

您可以查看this demo on SQLFiddle（不包含exp＆gt; now（）部分）。