转换行中的列并获取 postresql 中同一列的不同值的计数

Question

测试转换行中的列并获取 postresql 中同一列不同值的计数

Answer 1

You can do conditional aggregation. Postgres supports the standard filter() clause, that comes handy here:

select
    activity_tag,
    bank,
    count(*) filter(where within_beyond = 'WITHIN') within_count,
    count(*) filter(where within_beyond = 'BEYOND') beyond_count
from mytable
group by activity_tag, bank