SQL查询问题SQLite

4柱

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

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

我需要计算用户在UserA列或UserB列中出现的次数

group by UserA COLL不成功我需要计算john在UserA和UserB cols中总共出现了多少次

预期产量

john 3
ron 2
kyle 1

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您似乎希望

全部联合

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

---

您似乎希望

全部联合

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

---

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

---

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