mysql - 使用 Distinct 返回重复值。如何避免这种情况？

Question

询问：

  select distinct (Customer) ,CustomerID from history where Customer != '' and        Customer LIKE 'Ram%';

结果：

      Ramer ram100
      Raman ra45
      Raman ra45

Answer 1

尝试使用MAXand group by。

 select Customer, MAX(CustomerID) CustomerID
 from   history
 where  Customer != '' AND Customer LIKE 'Ram%'
 GROUP BY Customer 

Answer 2

如果您还想查看所有客户 ID，请使用group_concat

select customer, group_concat(distinct customerid)
from history
where Customer != '' and Customer like 'Ram%'
group by customer