/* select#1 */ select sum(`sakila`.`b`.`amount`) AS `sum(amount)` from `sakila`.`customer` `a` join `sakila`.`payment` `b` where ((`sakila`.`b`.`customer_id` = `sakila`.`a`.`customer_id`) and (`sakila`.`a`.`email` = 'JANE.BENNETT@sakilacustomer.org')) (北联网教程,专业提供视频软件下载)
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