Joining is where you are able to combine data
from the SAME data source, for example worksheets in an Excel file or tables in
an Oracle database. You need a common field, also called a key, that
tells Tableau how to join the data. You also need a key to do blending.
Blending is where you able to combine data from DIFFERENT data
sources, for example a worksheet in Excel with a table from an Oracle
database. This is very powerful because in the past you would typically
need to have someone with the specific technical skills create a new data set
with the combined information.
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