摘要： select DISTINCT category.`Code` from provincepricingcategory category join partsgroup cgroup on category.GroupCode=cgroup.code and cgroup.Category=2jo 阅读全文

摘要： http://www.cnblogs.com/yuangang/p/5569518.html 阅读全文

摘要： http://jingyan.baidu.com/article/f3ad7d0ffc061a09c3345bf0.html 阅读全文