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+{{ transformations:KeepDuplicatesAction.png}}
+====== KEEP DUPLICATES======
+Category: Transform / Filters\\
+\\
+=====Description=====
+This action keeps all duplicate rows and removes all unique rows. This operation can be performed on all columns, or only on specific columns. In the latter case, the uniqueness of values in columns not selected will be ignored.\\
+\\
+=====Use cases=====
+In datasets where all records should be unique, this action helps clean them by looking for duplicate values/records and pulling them out for review - to determine if those records warrant removal or modification.\\
+\\
+=====Action settings=====
+^Setting ^Description ^
+|Apply to|Select whether to check the values in all columns for duplicates, or just specified columns.  Options:  //All columns// or\\ //Selected columns// (and select the columns to check).|
+\\
+=====Examples=====
+**Objective:** Find duplicates in column "Continent".\\
+**Source table:** The longest rivers in the world
+^River  ^Length (km)  ^Continent  ^
+| Nile  |  6650| Africa  |
+| Amazon  |  6400| South America  |
+| Yangtze |  6300| Eurasia  |
+| Yellow River (Huang He) |  5464| Eurasia  |
+\\
+**Action parameters:**
+> Apply to "Selected columns"
+> Columns:  "Continent"
+\\
+**Result:**
+^River  ^Length (km)  ^Continent  ^
+| Yangtze  |  6300| Eurasia  |
+| Yellow River (Huang He)  |  5464| Eurasia  |
+\\
+=====See also=====
+  * [[transformations:deduplicate|Deduplicate rows]]
+  * [[transformations:filterminmax|Keep min/max]]
+  * [[transformations:keepremovematching|Keep/Remove matching]]