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Chapter 7 Reshaping Data 247
Joining Data Tables
Example 1: Join by Row Number
Joining tables by row number joins the two tables side by side, and the new table has all columns from
both tables (unless you specify to only include certain columns).
Joining Tables with an Unequal Number of Rows
If two tables you want to join have an unequal number of rows, the new table will have values for rows
found in both tables. For example, as Figure 7.26 shows, if one table with two rows (the table on the
left) is joined with a table with four rows (the table in the center), then the new table (the table on the
right) contains four rows.
Figure 7.26 Joining Tables by Row Number
7 Reshaping Data
Joining Columns with the Same Name
If the two tables have column names that are the same, the names of these columns in the new table
appear as “column name of table name.” For example, if you joined tables named Animal Data.jmp
and Reptile Data.jmp, and both tables contained a column named gender, the new table contains
columns named gender of Animal Data and gender of Reptile Data, as shown in Figure 7.27.
Figure 7.27 Joining Tables by Row Number
As a similar example, suppose you want to combine the eight rows from each data table shown in
Figure 7.28 into a single table. You want to combine them so the new table contains all columns from
both tables. Follow along with this next example by opening Trial1.jmp and Trial2.jmp from the Sample
Data folder that was installed when you installed JMP.