{{ transformations:SkipUnchangedAction.png}}
====== SKIP IF UNCHANGED ======
Category: Workflow / Internal \\

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=====Description=====
This action skips the rest of the actions in the table if the current dataset did not change since the previous workflow run.\\

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=====Use cases=====
  * Provides a simplified way to detect dataset changes when a workflow is triggered by a Server trigger or by a Launcher task.
  * This action allows for running additional actions - tests or modifications - to a dataset that has changed between workflow runs, and skip those actions if the dataset has //not// changed.

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=====Action settings=====
^Setting^Description^
|Previous run |This displays the time-date-stamp of the last time the workflow was run.  Use //View dataset// to review the dataset during the previous run.  Press //Forget// to remove the last stored dataset.  |
|Track changes in column(s) |Select which column or columns this action will detect changes in.  |
|Change detection mode |Choose the type of changes to detect.  Options:  (first icon) //Return added or changed rows compared with the previous run// (will return any rows that were added or changed since the previous run), (second icon) //Return missing rows compared to the previous run// (will return rows that are now missing in the dataset since the previous run). |
|If skipped, the output is |Select what the output dataset of this action will be if this action is triggered and the rest of the actions are skipped.  Options: //Empty// (an empty dataset is output) or //Current dataset// (and the incoming dataset to this action is passed along). |
|If the dataset from the previous run is missing|Choose how this action will respond when the previous dataset is missing.  Options: //Skip// (skip the remaining actions in the table) or //Do not skip// (allow the remaining actions in this table to run).  |

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=====Remarks=====
When **Previous run** shows //No information.  Run this action at least once.//, there was no previous workflow run, or the user chose to remove the stored dataset from the previous run by using the //Forget// button.  This action will need to be run at least once to store a dataset to compare to.

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=====Examples=====
In the table below, the previous dataset changed (based on the //Detection mode// selected), and the subsequent actions have been executed (their pictograms show their default appearances).\\
{{https://community.easymorph.com/uploads/default/original/2X/f/f8a71586752280bf4e2b0e52b9ee3c1ae4178c5f.png  }}
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Using the same table and mode, this time the dataset did not change, and the actions after the //Skip if unchanged// action are skipped (displayed with red arrows).\\
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{{https://community.easymorph.com/uploads/default/original/2X/e/e46c6d229aeb1049cb0c359bc4f9afb0452c3f4f.png  }}
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=====See also=====
  * [[transformations:halt|Halt/Warn on condition]]
  * [[transformations:haltontypemismatch|Halt on data type mismatch]]
  * [[transformations:skiponcondition|Skip actions on condition]]
  * [[transformations:skiponconditioninanothertable|Skip on condition in another table]]