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246 Reshaping Data Chapter 7
Joining Data Tables
Option in JMP
Update first table with data
from second table
Merge same name
columns
Description
When Update first table with data from second table is
checked, column data from the second table are used to change
the data of the same name columns in the original table.
Notes:
• JMP will not replace data with missing values.
• The output table uses the same columns as the original table.
Thus, when you use Update first table with data from
second table, Select Columns for joined table is not
applicable.
• The Update first table with data from second table option
is available only when joining by row number or by matching
columns.
Click the box beside Merge same name columns if you want
the data from the second table to replace the data of the same
name columns in the original table, regardless of if they are
missing.
If you join by matching columns, the new table will contain a
column named Match Flag:
• If a one (1) appears in this column, the data originated from
the first (active) table.
• If a two (2) appears in this column, the data originated from
the second table.
• If a three (3) appears in this column, the data was found in
both the first and second tables.
Copy formula
Suppress formula
evaluation
Keep dialog open
To include formulas from the original table in the output
columns, click the box beside Copy formula.
To prevent JMP from evaluating columns’ formulas during the
creation of the new table, click the box beside Suppress
formula evaluation.
To keep this window open after clicking OK, check the box
beside Keep Dialog Open.
3 Click OK to see the new data table.
Examples of Joining Data Tables
The following sections give examples of how to use the Join command.