SQL语句如下：
select
country,
sum(case when type='A' then money end) as A,
sum(case when type='B' then money end) as B,
sum(case when type='C' then money end) as C
from table1
group by countryselect
country,
sum(case when type
阅读背景：
一道SQL面试题——表行列数据转换(表转置)
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