SQL：PIVOT與加盟

Question

新手問題：

我見下表

Period Customer Balance 
40  1  10 
40  2  15 
39  1  9 
38  1  10 
38  2  20 

我想訂購它，這樣我每個時期一列，

Customer BalancePeriod38 BalancePeriod39 BalancePeriod40 
1    10    9    10 
2    15    .    20 

是這可能嗎？

Answer 1

您可以樞使用聚合與案件數據：

select customer, 
    sum(case when period = 38 then balance else 0 end) as balance_period_38, 
    sum(case when period = 39 then balance else 0 end) as balance_period_39, 
    sum(case when period = 40 then balance else 0 end) as balance_period_40 
from your_table 
group by customer;