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SQL code copied to buffer
Task

Gap & Islands problem

MySQL
For customer MARY SMITH (customer_id = 1) find all periods when she had at least one rented film. Output the result table with columns: 
period_id - serial number of period, from_date, to_date start and and rental period.
Expected result Columns: 3 · Rows: 5
period_id from_date to_date

Sample rows open after wrong checks: 0 of 3

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