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add zero column note
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README.Rmd

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@@ -92,5 +92,5 @@ To install `rqdatatable` please use `install.packages("rqdatatable")`.
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Note `rqdatatable` is intended for "simple column names", in particular as `rqdatatable` often uses `eval()` to work over `data.table` escape characters such as "`\`" and "`\\`" are not reliable in column names.
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Note `rqdatatable` is intended for "simple column names", in particular as `rqdatatable` often uses `eval()` to work over `data.table` escape characters such as "`\`" and "`\\`" are not reliable in column names. Also `rqdatatable` does not support tables with no columns.
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README.md

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@@ -133,3 +133,4 @@ To install `rqdatatable` please use `install.packages("rqdatatable")`.
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Note `rqdatatable` is intended for “simple column names”, in particular
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as `rqdatatable` often uses `eval()` to work over `data.table` escape
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characters such as “`\`” and “`\\`” are not reliable in column names.
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Also `rqdatatable` does not support tables with no columns.

docs/index.html

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docs/reference/ex_data_table.relop_drop_columns.html

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