如何查询最近7天的用户注册数据
统计图如图所示:
期望得到的数据格式:
[
{created_at:'2020-7-23',num:0}
{created_at:'2020-7-24',num:0}
{created_at:'2020-7-25',num:0}
{created_at:'2020-7-26',num:0}
{created_at:'2020-7-27',num:3}
{created_at:'2020-7-28',num:0}
{created_at:'2020-7-29',num:0}
]
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