sql的执行顺序是什么样子呢？
正常执行sql的查询顺序：select … from … where … group by … having … order by … limit的执行顺序但是执行sql的时候，数据库是怎么执行的呢 ？简单：from>where>group by>having>select>order by>limit复杂：from > join on > where > group
