用EXISTS替代IN
4503.com,用NOT EXISTS替代NOT IN
用表连接[left、right、inner]查询替换EXISTS

sql实施效用小结–待持续新加创新,sql实践功能

用EXISTS替代IN
用NOT EXISTS替代NOT IN
用表连接[left、right、inner]查询替换EXISTS

用EXISTS取代IN 用NOT EXISTS替代NOT IN
用表连接[left、right、inner]询问替换EXISTS…