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transformations:deletedbrowsbykeys [2017/05/03 03:00] (current)
dmitry created
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 +===== Delete matching database rows =====
 +Deletes rows in database table where a combination of key fields matches a combination of key fields in EasyMorph table. 
 +In alternative mode, deletes rows where a combination of key fields DOESN'T MATCH any combination of key fields in EasyMorph table.
 +Under the hood the transformation creates a temporary table in the target database, uploads key field combinations into it and performs DELETE..WHERE ..EXISTS statement. After the statement is executed the temporary table is deleted.
 +The operation is //atomic//, meaning that it either successfully deletes all matching (or non-matching) rows, or doesn't delete anything if a failure occurs.
 +**Use cases**
 +This transformation can be used for deleting records which IDs are obtained from another data source (e.g. text file or spreadsheet).
transformations/deletedbrowsbykeys.txt · Last modified: 2017/05/03 03:00 by dmitry