How do the tables relate?
The connection to the MySQL database con
has already been created for you. tables
, a list containing the three tables as data frames that you've created in the previous exercise, is also available.
If you have a closer look at these tables, you'll see that the tweats
table, for example, contains a column user_id
. The ids in the column refer to the users that have posted the tweat. Similarly, the comments
contain both a user_id
and a tweat_id
column. It specifies which user posted a comment on which tweat.
With this new knowledge, can you tell who posted the tweat on which somebody commented "awesome! thanks!" (comment 1012)?
Este exercício faz parte do curso
Intermediate Importing Data in R
Exercício interativo prático
Transforme a teoria em ação com um de nossos exercícios interativos
