# Dpylr do equivalent in query.jl standalone syntax?

**URL:** https://discourse.julialang.org/t/dpylr-do-equivalent-in-query-jl-standalone-syntax/24745
**Category:** Data
**Created:** [May 29, 2019, 8:23pm UTC](https://discourse.julialang.org/t/dpylr-do-equivalent-in-query-jl-standalone-syntax/24745 "2019-05-29T20:23:25Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![tlnagy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tlnagy/32/5815_2.png) [@tlnagy](https://discourse.julialang.org/u/tlnagy)
#### Post date: [May 31, 2019, 2:22am UTC](https://discourse.julialang.org/t/dpylr-do-equivalent-in-query-jl-standalone-syntax/24745/4 "2019-05-31T02:22:37Z")

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Whoa cool. So what does the `_ _` refer to on the `@mapmany` line? It looks like it’s the original dataframe somehow, but how does it know that that’s what you’re referring to?

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