Mysql 对组功能有问题

上述“百分比”已按计数/总计数*100计算。我有下面的代码来实现这个

User     Product     count    Percentage 
User1    Product1     21        38.1818
User1    Product2     34        61.8182

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但是55号已经硬编码了。我不希望这是硬编码。因此，我怎样才能做到这一点。我尽了最大的努力，但还是成功了

在MySQL中，您将使用一个

join

/correlated子查询：

select user, product, count(id) as count, count(id)/55*100 from table1 where  
user=user1 group by product. 

在MySQL 8.0+中，您只需使用一个窗口函数：

select user, product, count(id) as count,
       count(id) / (select count(*) from table1 tt1 where tt1.user = t1.user)
from table1 t1
where t1.user = user1
group by user, product;

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在MySQL中，您将使用一个

连接
/相关子查询：

select user, product, count(id) as count, count(id)/55*100 from table1 where  
user=user1 group by product. 

在MySQL 8.0+中，您只需使用一个窗口函数：

select user, product, count(id) as count,
       count(id) / (select count(*) from table1 tt1 where tt1.user = t1.user)
from table1 t1
where t1.user = user1
group by user, product;