使用Distinct返回重複值。如何避免這種情況？

Question

查詢：

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

結果：

 Ramer ram100 
     Raman ra45 
     Raman ra45 

Answer 1

嘗試使用MAX和group by。

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

Answer 2

如果你想看到所有客戶ID以及使用group_concat

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