R의 data.table로 데이터 결합하기

This chapter will show you how to perform simple joins that will enable you to combine information spread across multiple tables.

In this chapter you will perform joins using the data.table syntax, set and view data.table keys, and perform anti-joins.

This chapter will discuss common problems and errors encountered when performing data.table joins and show you how to troubleshoot and avoid them.

In the last chapter of this course you'll learn how to concatenate observations from multiple tables together, how to identify observations present in one table but not another, and how to reshape tables between long and wide formats.