我有一个更新的条目日志,每个条目的编号都有不同的更新类别。 例如Mysql获取组的最新条目
|Ticket Number | DateTime | Update | Category |
| I0001 | 2015-07-28 | Spoke to someone | Update |
| I0002 | 2015-07-28 | Issue started | Update |
| I0002 | 2015-07-27 | Owner changed | System |
| I0002 | 2015-07-26 | Auto Alarm | System |
| I0001 | 2015-07-28 | More affected | Update |
| I0001 | 2015-07-25 | Auto Alarm | System |
| I0003 | 2015-07-01 | Assigneed | Update |
我希望它有一个列表,它显示了最后的日期时间,更新每个票号及类别,所以我将结束与此类似。
|Ticket Number | DateTime | Update | Category |
| I0001 | 2015-07-28 | Spoke to someone | Update |
| I0002 | 2015-07-28 | Issue started | Update |
| I0002 | 2015-07-27 | Owner changed | System |
| I0001 | 2015-07-25 | Auto Alarm | System |
| I0003 | 2015-07-01 | Assigneed | Update |
我试过几种方法,但没有接近完成它。
能否请您创建一个sqlfiddle? – Jens
小提琴中的数据的结果是什么? – Jens
是否有某种在此表中自动增量的ID列? –