# Difference between df\[:, :a\] and df\[!, :a\]

**URL:** <https://discourse.julialang.org/t/difference-between-df-a-and-df-a/28561>\
**Category:** General Usage\
**Tags:** dataframes\
**Created:** [September 9, 2019, 1:59pm UTC](https://discourse.julialang.org/t/difference-between-df-a-and-df-a/28561 "2019-09-09T13:59:36Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [January 18, 2023, 9:26pm UTC](https://discourse.julialang.org/t/difference-between-df-a-and-df-a/28561/8 "2023-01-18T21:26:46Z")

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2 posts were split to a new topic: [Copy vs view of DataFrame column?](https://discourse.julialang.org/t/copy-vs-view-of-dataframe-column/93182)

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_[View the full topic](https://discourse.julialang.org/t/difference-between-df-a-and-df-a/28561)._