SQL查询麻烦SQLite

Question

4 colums

get_nth_smallest_value <- function(n) {
  unique(sort(x))[n]
}

get_nth_smallest_value(2)
#[1] 6

get_nth_smallest_value(3)
#[1] 7

我需要计算用户在UserA列或UserB列中出现的次数

按UserA colum组不是succifient我需要计算john从UserA和UserB cols总共出现的次数

预期产出

| day of year | year | user A | user B |

      1          1      john      ron
      2          1       ron      john
      1          2       john     kyle

Answer 1

您似乎想要union all

select user, count(*) counts from
(
    select [user A] as user from table t
    union all
    select [user B] as user from table t
)a
group by user

Answer 2

您可以编写如下查询： -

select user, sum(cnt) total
from 
(select userA as user, count(*) cnt from table group by userA
UNION ALL
select userB as user, count(*) cnt from table group by userB
) a11
group by user