如何使用ggplot2可视化tbl_sql数据？

Question

I'm getting the error, ggplot2 does not know how to deal with data of class tbl_sqlite/tbl_sql/tbl_lazy/tbl . Does this mean I need to reduce the size of my data or convert it to another format before I can plot it?

Answer 1

dplyr holds off on actually collecting the data into r until it is explicitly told to. When using dplyr to query a database, be sure to use collect at the end of the chain to pull the query result into r as a data frame.

addendum : the dbplot package now provides helper functions to work with dplyr & dbplyr to do some plotting or calculations for intermediate plotting steps in-database