# DataFrame: how to change value of a cell without knowing the row number

**URL:** <https://discourse.julialang.org/t/dataframe-how-to-change-value-of-a-cell-without-knowing-the-row-number/22024>\
**Category:** Data\
**Tags:** dataframes\
**Created:** [March 19, 2019, 8:15am UTC](https://discourse.julialang.org/t/dataframe-how-to-change-value-of-a-cell-without-knowing-the-row-number/22024 "2019-03-19T08:15:35Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Ajaychat3](https://avatars.discourse-cdn.com/v4/letter/a/ecd19e/32.png) [@Ajaychat3](https://discourse.julialang.org/u/Ajaychat3)\
**Post date:** [March 19, 2019, 8:18am UTC](https://discourse.julialang.org/t/dataframe-how-to-change-value-of-a-cell-without-knowing-the-row-number/22024/2 "2019-03-19T08:18:45Z")

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This should work.

```julia
df[(df[:name] .== "Sally"),:age]=99

```

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_[View the full topic](https://discourse.julialang.org/t/dataframe-how-to-change-value-of-a-cell-without-knowing-the-row-number/22024)._