In a trigger there are 1000 records how can you execute 200 records for each batch?

A Salesforce trigger executes on the entire batch it receives—you can't split 1,000 trigger records into batches of 200 within the trigger itself. If you need to process records in smaller chunks, use an asynchronous approach such as Batch Apex (batch size of 200), Queueable Apex, or process the records in manageable collections after the trigger fires.

Always keep your trigger bulkified and avoid DML or SOQL inside loops to stay within governor limits.

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