id lat long speed date address
1 22.92138131 72.44103313 3.96 km/h 2011-09-26 National, Gujarat, India
2 22.92138145 72.44103413 13.96 km/h 2011-09-26 National, Gujarat, India
3 22.92138134 72.44103423 15.96 km/h 2011-09-26 National, Gujarat, India
4 22.92138454 72.44103233 13.96 km/h 2011-09-26 10t ring Rd, Nehru Nagar
5 22.92138354 72.44102533 13.96 km/h 2011-09-26 Anandnagar Rd, Ahmedabad
6 22.92138484 72.44103293 19.96 km/h 2011-09-26 Anandnagar Rd, Ahmedabad
重复行我想编写一个查询,使得我的结果是这样的:删除从表
id lat long speed date address
1 22.92138131 72.44103313 3.96 km/h 2011-09-26 National, Gujarat, India
4 22.92138454 72.44103233 13.96 km/h 2011-09-26 10t ring Rd, Nehru Nagar
5 22.92138354 72.44102533 13.96 km/h 2011-09-26 Anandnagar Rd, Ahmedabad
我想根据地址删除重复的行。
请仔细阅读http://en.wikipedia.org/wiki/Database_normalization – YXD
如果地址重复,您希望返回结果集中的哪一行?首先通过ID? –
身份证2在不重复任何其他行..你为什么要删除这也.. –