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Value error when running

hi, does it work successful with 1.4.6?

Roadmap 1.1.0

nice!!!

Interacting with a relational database

@st-pasha I think those API is more commonly used, but my development ability is weaker....

Removing a column that is not in the columnset is error

![dt_error](https://user-images.githubusercontent.com/47625450/125227383-65f79c80-e305-11eb-921f-e6805559fe19.png) [document/user guide/f-expressions](https://datatable.readthedocs.io/en/latest/manual/f-expressions.html)

Removing a column that is not in the columnset is error

@samukweku the datatable's version is '1.0.0'

How to uninstall julia with jill.py

@johnnychen94 thanks :)

Implement `janitor::clean_names()`

nice! it is a good idea! :) @mjkarlsen

Bug when renaming file (notebook 6.4.12)

i get the same error

' panicked at 'Could not retrieve core::option::Option<chrono::naive::datetime::NaiveDateTime> from Value'

thanks @wangxiaoying - the code like: ` df = pl.read_sql(sql, conn) ` - the database is mysql - I guess the most likely reason is that the datetime means like...

What about polar coords?

where is coord_polar?