1. AT-FIRST: This is used when we want to execute the statements before records are processed.

2. AT-LAST: This event is used when we want to execute the statements after all records are processed.

3. AT-NEW: This event is used when we want to execute the statement before group of records are processed.

4. AT-END: This event is used when we want to execute the statements after processing of group of records.

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