想实现的功能：
按两个属性搜索，如图：
数据库设计如图：（数据库设计已定不能更改了）
这是category_value表
这是 buy_6表
我写的sql语句：
select b.* from category_value as v, buy_6 as b where status=3 and v.itemid = b.itemid and v.moduleid=6 and v.value between 2 and 7 and v.oid=6 and v.value between 1 and 10 and v.oid=4
如果只按一个数据搜索没问题，两个属性就搜索不出数据
sql中v.oid=4指的是颜色属性id为4，v.oid=6指的是高度属性id为6
------解决思路----------------------
这不是 between 的问题！
在你的 sql
select b.* from category_value as v, buy_6 as b where status=3 and v.itemid = b.itemid and v.moduleid=6 and v.value between 2 and 7 and v.oid=6 and v.value between 1 and 10 and v.oid=4
既然 v.oid 不可能同时等于 6 和 4
那么自然就不会有结果的
------解决思路----------------------
按你的意思，似乎应该是：
(v.value between 2 and 7 and v.oid=6) or (v.value between 1 and 10 and v.oid=4)
所以sql语句应该为：
select b.* from category_value as v, buy_6 as b where status=3 and v.itemid = b.itemid and v.moduleid=6 and ((v.value between 2 and 7 and v.oid=6) or (v.value between 1 and 10 and v.oid=4))