SQL：带连接的 PIVOT

Question

新手问题：

下面有table

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

我想订购它，以便每个时期都有一列，

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

这可能吗？

Answer 1

您可以透视数据，使用带大小写的聚合：

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;

SQL：带连接的 PIVOT

SQL: PIVOT with join

sql

pivot

crosstab