[英]Grouping & Aggregation about Character linking[in SQL HANA DATABASE]
My data frame like this: 我的数据框是这样的:
> mydata
time id product
1 201301 1 apple
2 201302 1 htc
3 201302 1 apple
4 201302 2 htc
5 201302 2 apple
How get the following result? 如何获得以下结果?
> result
time id product
1 201301 1 apple
2 201302 1 apple&htc
3 201302 2 apple&htc
I have tried ddply()
function like this: 我已经尝试过
ddply()
函数,如下所示:
ddply(mydata,.(time,id),summarise,paste0(product,"&",product))
But it doesn't work as my expectation.Thanks for your answers. 但这不符合我的预期。谢谢您的回答。
And,my point is, how to realize in SQL in SAP HANA DATABASE? 而且,我的意思是,如何在SAP HANA DATABASE中的SQL中实现? Thanks a lot!
非常感谢!
you can try this: 您可以尝试以下方法:
ddply(tab, .(time, id), summarise, product = paste(product, collapse="&"))
hth 心连心
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