SELECT count(*) FROM 表名 WHERE 条件
这样查出来的是总记录条
SELECT count(*) FROM 表名 WHERE 条件 GROUP BY id
//这样统计的会是每组的记录条数.
select count(*) from (select ...from .....where ......group by .....) a;
select count(*) from(
selectIFNULL(AVG(a.price),0) currentPrice,
a.data_time dealDate,
gc.name className
from ezs_price_trend a,ezs_goods_class gc,ezs_dict e1,ezs_dict e2 where e1.code like 'EZS_COLOR%' and e2.code like 'EZS_FORM%'
and a.goodClass_id = gc.id and a.color_id = e1.id and a.form_id = e2.id and a.type = '3'
/*多条件查询*/
GROUP BY DATE_FORMAT(a.data_time,'%Y-%m-%d') ORDER BY a.data_time desc
) a ;
select
a.data_time,DATE_FORMAT(a.data_time,'%Y-%m-%d'),
date_add(DATE_FORMAT(a.data_time,'%Y-%m-%d'),interval 1 MONTH)/*增加月份*/,
DATE_SUB(DATE_FORMAT(a.data_time,'%Y-%m-%d'),interval 1 MONTH)/*减少月份*/
from ezs_price_trend a
/*多条件查询*/
GROUP BY DATE_FORMAT(a.data_time,'%Y-%m-%d') ORDER BY a.data_time desc;