按周查找总计

Question

我有一张表 table，其中包含 date 和 total 列。

如何将过去 20 周内 total 列的 sum 按周聚合到 sysdate？

Answer 1

select trunc(date,'D'), sum(total)
from table
where date >= trunc(sysdate - 20*7, 'D')
group by trunc(date,'D')
order by 1

Answer 2

SELECT *, CONCAT(YEAR(`sysdate`), '/', WEEK(`sysdate`)) AS `year_week`
FROM `table`
GROUP BY `year_week`
ORDER BY `year_week` DESC
LIMIT 20;