Cancels any changes made since a savepoint was established. Changes made
    prior to the savepoint are not undone; they are still
    pending.
Syntax
ROLLBACK TO SAVEPOINT [ savepoint-name ]
 
Parameters
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      - savepoint-name – an identifier that was specified on a SAVEPOINT statement within the current transaction. If
              savepoint-name is omitted, the most recent
            savepoint is used. Any savepoints since the named savepoint are automatically
            released.
 
     
Standards
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        - SQL—Vendor extension to ISO/ANSI SQL grammar.
 
- SAP Sybase Database product—Savepoints are not supported by
              Adaptive Server. To implement similar features
            in an Adaptive Server-compatible manner, you can
            use nested transactions.
 
       
     
Permissions
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      None, but there must have been a corresponding SAVEPOINT within the current transaction.