I want a subset of A with a1 value distinct. the current distinct will compare all the fields in A, which is not what I want.
Haitao Yao yao.e...@gmail.com weibo: @haitao_yao Skype: haitao.yao.final 在 2012-6-27，上午11:18， Jonathan Coveney 写道： > What is your desired output? Sounds like you want a group. > > 2012/6/26 Haitao Yao <yao.e...@gmail.com> > >> hi, >> How can I distinct only one field of a relation? >> here's the demo: >> >> A = LOAD 'data' AS (a1:int,a2:int,a3:int); >> B = distinct A by a1; >> >> >> how can I do this? >> >> >> >> Haitao Yao >> yao.e...@gmail.com >> weibo: @haitao_yao >> Skype: haitao.yao.final >> >>
