mysql where条件：某时间字段为今天的sql语句

king 监控 2023-02-26 841浏览 0

1.查询：注册时间为今天的所有用户数：

select count(*) from customer where TO_DAYS(createtime) = TO_DAYS(NOW())

2.获取当前时间到凌晨24点还有多长时间：（Java中可用于判断某时间是否为今天）

final Calendar cal = Calendar.getInstance();

cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH) + 1);

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

cal.set(Calendar.MILLISECOND, 0);

final double diff = cal.getTimeInMillis() - System.currentTimeMillis();

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