select query for time interval in mysql and php

Question

select query to select all records that were inserted in 15 minutes.for ex if now time is 10:00 then it shoulld fetch all record inserted from 9:45 to 10:00

Answer 1

Assuming you have a DATETIME column named created in your table:

SELECT id FROM tablename 
WHERE ((created > DATE_SUB(NOW(), INTERVAL 15 MINUTE))
  AND (created < NOW()))

Answer 2

select * from table WHERE datetimeField BETWEEN date_add(NOW(),INTERVAL -15 MINUTE) AND NOW();