Question

我有兴趣了解上个月每天有多少用户注册。我有这个非常简单的查询，告诉我上个月注册了多少用户。如何修改查询以便在白天给我结果？

SELECT first_name, last_name, created_at
FROM users
WHERE created_at > '2017-01-01'
AND created_at < '2017-02-01'
ORDER BY created_at DESC;

Answer 1

SELECT count(*) as user_cnt, created_at
FROM users
WHERE created_at > '2017-01-01'
AND created_at < '2017-02-01'
GROUP  BY created_at

如果created_at字段是日期时间

SELECT count(*) as user_cnt, date(created_at) as created_date
FROM users
WHERE created_at > '2017-01-01'
AND created_at < '2017-02-01'
GROUP  BY date(created_at)

MySQL，按天分组上个月的数据？

1 个答案: