php - Query to see how many times employees has worked same shifts -


i run management system people work different shifts registered.

i'd able make display of how many times each worker/volunteer worked same shifts, this:

    |amy|carl|max|     |---|----|---| amy | x | 2  | 6 | carl| 2 | x  | 5 | max | 6 | 5  | x |

i hoping had ideas how form query. idea i've come far make php create custom query each user.

select count(common between user 1 , 2), count(common between user 1 , ...) select count(common between user 2 , 1), count(common between user 2 , ...)

etc..

i consider ugly way , hoping there way of retrieving data within single query.

the database stored this:

shifts

  • id
  • from
  • to

working

  • id
  • shiftid
  • userid

users

  • id
  • name

you'll have self-join working table:

select a.userid, b.userid, count(a.shiftid) common_shifts working inner join working b on ((a.shiftid = b.shiftid) , (a.userid <> b.userid)) having common_shifts > 0

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