Question

I have a database with many tables and one particular table has columns:

1. name
2. e-mail
3. no:
4. address
5. start_date(include time also)
6. end_date(include time also)
7. id

I need to select only the name and the e-mail addresses of the persons satisfying the condition that:

1. he appears twice in the list
2. the difference between the time in fields Start_date and end_date must be 10+minutes

Answer 1

You can join the table onto itself like this:

SELECT `a`.`name`, `a`.`email`
FROM `table_name` `a`
JOIN `table_name` `b` ON
  (`a`.`name` = `b`.`name` OR `a`.`email` = `b`.`email`)
  AND `a`.`id` != `b`.`id`
  AND `a`.`end_date` < DATE_ADD(`a`.`start_date`, INTERVAL 10 MINUTE)
GROUP BY `a`.`name`

Example

While you loop the results you can easily create valid CSV data using fputcsv().