我有多个表(假设有10个表),如下所示:
process.env.MY_API_KEY
我想计算每个表中C = 1列的次数,并创建一个新表,如下所示:
******** ******** *********
* day1 * * day2 * .... * day10 *
******** ******** *********
A B C .. A B C .. A B C ...
1 4 9 .. 7 6 8 .. 9 6 2 ...
7 2 1 .. 0 2 1 .. 0 5 1 ...
3 3 1 .. 0 9 7 .. 1 4 1 ...
7 8 0 .. 1 6 5 .. 2 6 1 ...
******** ******** *********
类似这样的东西:
**********
* output *
**********
day num
1 2
2 1
. .
. .
10 3
**********
什么是最好的方法? (我是SQL新手)
答案 0 :(得分:1)
request.query.orderBy.timestamp == 'ASC'
然后在其上进行COUNT(*)天的分组。
答案 1 :(得分:1)
我是新手,但会尽力而为:
假设您有第1天〜第3天,只有三个表:
SELECT
1 AS day,
COUNT(day1.C) AS num
FROM
day1
WHERE day1.C = 1
UNION ALL
SELECT
2 AS day,
COUNT(day2.C) AS num
FROM
day2
WHERE day2.C = 1
UNION ALL
SELECT
3 AS day,
COUNT(day3.C) AS num
FROM
day3
WHERE day3.C = 1
这将为您提供:
day num
1 1 2
2 2 1
3 3 3