摘要:
1.hump [hʌmp]驼背 So does he have a hump? A hump and a hairpiece?2.chark [tʃɑ:k]粉笔,木炭3.I don't want her to go through what I went through with Carl我只是不想... 阅读全文
摘要:
转自:http://www.cnblogs.com/lyhabc/archive/2013/02/10/2909761.html当大家发现数据库查询性能很慢的时候,大家都会想到加索引来优化数据库查询性能,但是面对一个复杂的SQL语句,找到一个优化的索引组合对人脑来讲,真的不是一件很简单的事。好在SQ... 阅读全文