I have a two column with date (from, to) in date format (Y-m-d), and I need MySQL SELECT which returns a correct value:
eg. I have same events:
 1. 2015-07-10 to: 2015-07-25
 2. 2015-07-21 to: 2015-07-24
 3. 2015-07-19 to: 2015-08-01
 4. 2015-07-29 to: 2015-08-05
 5. 2015-08-05 to: 2015-08-06
 6. 2015-08-10 to: 2015-08-10
and I need all events which is between 2015-07-11 and 2015-07-21.
**expected results:** 
*1,2,3*
Thank you!
 
     
    