统计今日、昨日的帖子数量,php mysql 语句 该如何书写?急!!!
回复讨论(解决方案) 建议把表结构贴出来以供分析
你数据表的结构最好发一下,因为都不知道你的数据表帖子的时间字段是什么格式的
现举最简单的表结构如下: 如提所问,php mysql 语句该如何书写?
select count(id) from table where datetime=curdate()-1 昨天
select count(id) from table where datetime=curdate() 今天
select date_format(tb_send_date, '%y-%m-%d') as date, count(*) as cnt from tbl_name group by to_days(tb_send_date) order by desc limit 2
$today_rows=select count(*) from table where tb_send_date>='.date('y-m-d 00:00:00').' and tb_send_date='.$tomorrow. 00:00:00' and tb_send_date='.date('y-m-d 00:00:00').' and tb_send_date='.$tomorrow. 00:00:00' and tb_send_date='.date('y-m-d 00:00:00').' and tb_send_date='.$tomorrow. 00:00:00' and tb_send_date='.date('y-m-d 00:00:00').' and tb_send_date='.$tomorrow. 00:00:00' and tb_send_date='.date('y-m-d 00:00:00').' and tb_send_date='.$tomorrow. 00:00:00' and tb_send_date<='.$tomorrow. 23:59:59';;//昨天
曾有人教我,mysql中where 子句尽量少用函数,因为会导致索引无效
额,你说的where字句的函数 是sql的吧,貌似你搞错了
sorry,是sql