mysql-msql的索引和表查询的操作
mysql索引
今天看了一下午的资料，感觉还是模糊的，就是加了索引之后，同样的查询语句会用时比之前短，但我新手明白为什么这样用，
而里面索引具体怎么实现的比较模糊，再有就是多个表之间怎么建立关系？就是查歌手表的歌手的id就能查到歌曲表，歌手信息表等多个相关表的信息？是外键？希望大家解答一下！
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