# \#combine

**URL:** https://discourse.julialang.org/tag/combine/994.md

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## [Nested groupby](https://discourse.julialang.org/t/nested-groupby/78958)

<div class="topic-metadata">

**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 9\
**Last updated:** [July 23, 2022, 5:17am UTC](https://discourse.julialang.org/t/nested-groupby/78958 "2022-07-23T05:17:36Z")

</div>

trying to understand the role of kwarg isgathered, I practiced this exercise. julia\> ds = Dataset(id = \[1,1,1,1,1,2,2,2,3,3,3\], date = Date.(\["2019-03-05", "2019-03-12", "2019-04-10", …