Differences

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--- transformations:lookuprename [2016/09/20 23:17] – created dmitry
+++ transformations:lookuprename [2021/04/12 01:56] – craigt
@@ Line 1: / Line 1: @@
-===== Rename with lookup =====
+{{ transformations:RenameColumnsAction.png}}
+====== RENAME COLUMNS  WITH LOOKUP ======
+Category: Transform / Advanced\\
+\\
+=====Description=====
+This action renames columns in a table by looking up old and new column names in another table.
+The lookup table should have 2 columns: one containing the old names, and one listing the new names.\\
+\\
+=====Use cases=====
+This action is typically used when names of columns to rename and/or the new names are not known in advance and have to be generated dynamically during a calculation, or from a set of known names in a lookup table.\\
+\\
+=====Action settings=====
+^Setting^Description^
+|Lookup table|Select the table containing the old and new column name values.|
+|Column with old names|Select the column in the selected table that contains the original column name values.|
+|Column with new names|Select the column in the selected table that contains the new column name values.|
+The reference to the second table will appear as a dotted line connecting this action to the second dataset in the application window.\\
+\\
+=====Remarks=====
+This action is //case sensitive//.  If the lookup values do not match the existing column names case-wise, a match is not made and the new column name is not assigned.
+If a match to a column is not found in the "old names" lookup column, the column will retain its original name.\\
+\\
+=====Examples=====
+**Objective:** Rename the columns in Table 1 using the old/new name pairings in Table 2.\\
+\\
+**Table 1:**  Source table columns.
+^FName  ^LName  ^Add1  ^Cty  ^ST  ^Zip  ^
+**Table 2:** Lookup table
+^Old names  ^New names  ^
+|FName  |FirstName  |
+|LName  |LastName  |
+|Add1  |Address  |
+|Cty  |City  |
+|St  |State  |
+|Zip  |Zip Code |
+\\
+**Action parameters:**
+>Lookup Table is "Table 2"
+>Column with old names is "Old names"
+>Column with new names is "New names"
+\\
+**Result:**
+^FirstName  ^LastName  ^Address  ^City  ^ST  ^Zip Code  ^
+Notice that "ST" wasn't renamed to "State" due to case issues ("ST" vs. "St").
+\\
+=====See also=====
+  * [[transformations:rename|Rename columns]]
+  * [[transformations:selectbylookup|Select columns by lookup]]
-This transformation renames columns in a table looking up old and new column names in another table.