我有这个数据:
column1 | column2
____________________
15 2013
16 2012
15 2012 //repeated
15 2012 //repeated
...
...
我想得到这个结果
15 2013
16 2013
15 2012 //not repeated
我有这个数据:
column1 | column2
____________________
15 2013
16 2012
15 2012 //repeated
15 2012 //repeated
...
...
我想得到这个结果
15 2013
16 2013
15 2012 //not repeated