quete jointure mehdi

mysql> SELECT lastname,firstname,role,name FROM wizard LEFT JOIN player ON wizard.id=player.wizard_id LEFT JOIN team ON team.id=player.team_id ORDER BY name ASC,role,lastname,firstname;
+-----------------+-------------+--------+------------+
| lastname        | firstname   | role   | name       |
+-----------------+-------------+--------+------------+
|                 | Crabbe      | NULL   | NULL       |
| Boot            | Terry       | NULL   | NULL       |
| Lupin           | Remus       | NULL   | NULL       |
| Patil           | Padma       | NULL   | NULL       |
| Patil           | Parvati     | NULL   | NULL       |
| Robins          | Demelza     | NULL   | NULL       |
| Slughorn        | Horace      | NULL   | NULL       |
| Weasley         | Charles     | NULL   | NULL       |
| Weasley         | Molly       | NULL   | NULL       |
| Black           | Sirius      | beater | Gryffindor |
| Brown           | Lavender    | beater | Gryffindor |
| Finnigan        | Seamus      | beater | Gryffindor |
| Hagrid          | Rubeus      | beater | Gryffindor |
| Longbottom      | Alice       | beater | Gryffindor |
| McGonagall      | Minerva     | beater | Gryffindor |
| Potter          | Harry       | beater | Gryffindor |
| Potter          | James       | beater | Gryffindor |
| Thomas          | Dean        | beater | Gryffindor |
| Weasley         | Arthur      | beater | Gryffindor |
| Weasley         | Percy       | beater | Gryffindor |
| Bell            | Katie       | chaser | Gryffindor |
| Dumbledore      | Albus       | chaser | Gryffindor |
| Granger         | Hermione    | chaser | Gryffindor |
| J.              | Lily        | chaser | Gryffindor |
| Jordan          | Lee         | chaser | Gryffindor |
| Longbottom      | Augusta     | chaser | Gryffindor |
| Longbottom      | Frank       | chaser | Gryffindor |
| Longbottom      | Neville     | chaser | Gryffindor |
| Pettigrew       | Peter       | chaser | Gryffindor |
| Spinnet         | Alicia      | chaser | Gryffindor |
| Weasley         | George      | chaser | Gryffindor |
| Wood            | Oliver      | chaser | Gryffindor |
|                 | Cadogan     | keeper | Gryffindor |
| Creevey         | Dennis      | keeper | Gryffindor |
| de              | Nicholas    | keeper | Gryffindor |
| Dumbledore      | Aberforth   | keeper | Gryffindor |
| Johnson         | Angelina    | keeper | Gryffindor |
| Weasley         | Ginevra     | keeper | Gryffindor |
| Binns           | Cuthbert    | seeker | Gryffindor |
| Creevey         | Colin       | seeker | Gryffindor |
| Gryffindor      | Godric      | seeker | Gryffindor |
| Vane            | Romilda     | seeker | Gryffindor |
| Weasley         | Fred        | seeker | Gryffindor |
| Weasley         | Ronald      | seeker | Gryffindor |
| Weasley         | William     | seeker | Gryffindor |
| Abbott          | Hannah      | beater | Hufflepuff |
| Finch-Fletchley | Justin      | beater | Hufflepuff |
| Friar           | Fat         | beater | Hufflepuff |
| Smith           | Hepzibah    | beater | Hufflepuff |
| Sprout          | Pomona      | beater | Hufflepuff |
| Tonks           | Nymphadora  | beater | Hufflepuff |
| Bones           | Amelia      | chaser | Hufflepuff |
| Scamander       | Newton      | chaser | Hufflepuff |
| Bones           | Susan       | keeper | Hufflepuff |
| Diggory         | Cedric      | keeper | Hufflepuff |
| Smith           | Zacharias   | keeper | Hufflepuff |
| Hufflepuff      | Helga       | seeker | Hufflepuff |
| Clearwater      | Penelope    | beater | Ravenclaw  |
| Quirrell        | Quirinus    | beater | Ravenclaw  |
| Ravenclaw       | Helena      | beater | Ravenclaw  |
| Warren          | Myrtle      | beater | Ravenclaw  |
| Chang           | Cho         | chaser | Ravenclaw  |
| Edgecombe       | Marietta    | chaser | Ravenclaw  |
| Flitwick        | Filius      | chaser | Ravenclaw  |
| Goldstein       | Anthony     | chaser | Ravenclaw  |
| Lockhart        | Gilderoy    | chaser | Ravenclaw  |
| Lovegood        | Luna        | chaser | Ravenclaw  |
| Lovegood        | Xenophilius | chaser | Ravenclaw  |
| Ollivander      | Garrick     | chaser | Ravenclaw  |
| Corner          | Michael     | seeker | Ravenclaw  |
| Ravenclaw       | Rowena      | seeker | Ravenclaw  |
| Trelawney       | Sybill      | seeker | Ravenclaw  |
| Bulstrode       | Millicent   | beater | Slytherin  |
| Crabbe          | Vincent     | beater | Slytherin  |
| Flint           | Marcus      | beater | Slytherin  |
| Parkinson       | Pansy       | beater | Slytherin  |
| Snape           | Severus     | beater | Slytherin  |
| Zabini          | Blaise      | beater | Slytherin  |
| Baron           | Bloody      | chaser | Slytherin  |
| Lestrange       | Bellatrix   | chaser | Slytherin  |
| Lestrange       | Rodolphus   | chaser | Slytherin  |
| Malfoy          | Draco       | chaser | Slytherin  |
| Malfoy          | Lucius      | chaser | Slytherin  |
| Nigellus        | Phineas     | chaser | Slytherin  |
| Nott            | Theodore    | chaser | Slytherin  |
| Riddle          | Tom         | chaser | Slytherin  |
| Tonks           | Andromeda   | chaser | Slytherin  |
| Black           | Regulus     | keeper | Slytherin  |
| Goyle           | Gregory     | seeker | Slytherin  |
| Lestrange       | Rabastan    | seeker | Slytherin  |
| Malfoy          | Narcissa    | seeker | Slytherin  |
| Slytherin       | Salazar     | seeker | Slytherin  |
| Umbridge        | Dolores     | seeker | Slytherin  |
+-----------------+-------------+--------+------------+
93 rows in set (0.00 sec)

mysql> SELECT lastname,firstname,role FROM wizard LEFT JOIN player ON wizard.id=player.wizard_id WHERE role="seeker";
+------------+-----------+--------+
| lastname   | firstname | role   |
+------------+-----------+--------+
| Binns      | Cuthbert  | seeker |
| Corner     | Michael   | seeker |
| Creevey    | Colin     | seeker |
| Goyle      | Gregory   | seeker |
| Gryffindor | Godric    | seeker |
| Hufflepuff | Helga     | seeker |
| Lestrange  | Rabastan  | seeker |
| Malfoy     | Narcissa  | seeker |
| Ravenclaw  | Rowena    | seeker |
| Slytherin  | Salazar   | seeker |
| Trelawney  | Sybill    | seeker |
| Umbridge   | Dolores   | seeker |
| Vane       | Romilda   | seeker |
| Weasley    | William   | seeker |
| Weasley    | Fred      | seeker |
| Weasley    | Ronald    | seeker |
+------------+-----------+--------+
16 rows in set (0.00 sec)

mysql> SELECT lastname,firstname FROM wizard LEFT JOIN player ON wizard.id=player.wizard_id LEFT JOIN team ON team.id=player.team_id WHERE player.role IS NULL ORDER BY lastname,firstname;
+----------+-----------+
| lastname | firstname |
+----------+-----------+
|          | Crabbe    |
| Boot     | Terry     |
| Lupin    | Remus     |
| Patil    | Padma     |
| Patil    | Parvati   |
| Robins   | Demelza   |
| Slughorn | Horace    |
| Weasley  | Charles   |
| Weasley  | Molly     |
+----------+-----------+
9 rows in set (0.00 sec)