SQL 返回月/年 col 和 COUNT 的命令

Question

I've been trying this for sometime, and appear to have hit a roadblock.

I want to group and count Hours by month.

My SQL Table:

id	Date	Hours
1	1645176391	2.1
1	1645435591	1.6
1	1642152391	1.4
1	1647246391	1.7
2	1647246391	2.5
1	1647591991	0.4

My current attempt:

SELECT FROM_UNIXTIME(Date, '%m-%Y') AS prod_month, COUNT(Hours)
            FROM my_table
            WHERE Date > [last 365 days in unix timestamp]
            AND id = 1
            GROUP BY
            prod_month;"

So, ideally the result would return something like:

prod_month	Hours
02-2022	3.7
01-2022	1.4
03-2022	2.1

Answer 1

Made three tweaks to your query:

• adopted SUM instead of COUNT , to sum up hours
• added ROUND to round your sum to two numbers
• used UNIX_TIMESTAMP to transform current date in unixtime and make comparison in the WHERE clause

SELECT FROM_UNIXTIME(Date_, '%m-%Y') AS prod_month, 
       ROUND(SUM(Hours),2)           AS Hours 
FROM my_table
WHERE UNIX_TIMESTAMP(CURDATE() - INTERVAL 1 YEAR) < Date_
  AND id = 1
GROUP BY FROM_UNIXTIME(Date_, '%m-%Y')

Check the demo here .