select a.id,b.id as mycompid,b.typeid,b.co_end,a.pro_price,
a.pro_name as realproname,a.discount_rate,a.bigpic,a.temp_url,b.co_name,
c.pro_name,d.city_name,a.begindate,a.modifydate,a.pro_intro
from product a
left join company b on(a.userid=b.id)
left join pro c on(b.proid=c.id)
left join city d on(b.cityid=d.id)
left join protype e on(a.typeid=e.id)
where (a.pro_name like binary '%%' or a.pro_intro like binary '%%' or a.keywords like binary '%%')
and co_type=112 and b.islock=0 and a.isdel=0 and a.comp_state=1 and b.islock=0 order by b.realtypeid desc,a.modifydate desc limit 0,20给大家简单解释下这句,就是搜索产品列表显示页 product产品表记录6万 company是企业表 记录4万 pro是省份信息,city是城市信息,protype是产品分类信息,主要是想搜索结果是以企业的等级排序,如果是同等级的就按产品的发布时间排序,所以就写了这么个SQL语句,不过效率真的很低,估计要6秒执行时间我测试了下,主要原因就出在排序 order by b.realtypeid desc,a.modifydate desc 这上面可是这个排序又必须要排,请大家帮我出出点子吧,应该怎么办!~
select a.id,b.id as mycompid,b.typeid,b.co_end,a.pro_price, a.pro_name as realproname,a.discount_rate,a.bigpic,a.temp_url,b.co_name, c.pro_name,d.city_name,a.begindate,a.modifydate,a.pro_intro from product a,company b,protype e
left join pro c on(b.proid=c.id)
left join city d on(b.cityid=d.id)
where a.userid=b.id and a.typeid=e.id and (a.pro_name like binary '%%' or a.pro_intro like binary '%%' or a.keywords like binary '%%') and co_type=112 and b.islock=0 and a.isdel=0 and a.comp_state=1 and b.islock=0 order by b.realtypeid desc,a.modifydate desc limit 0,20
这么多大量数据的表进行连续left join 太大啊
就是查询,之前不知道为什么like老是匹配不准,加个binary就好了,具体为什么,我也不清楚!~