1. Har bir talaba o’ziga berilgan predmet soha mavzusi bo’yicha and, or

so’rovlar yaratishi va natijasi bilan ko’rsatib o’tishi kerak. 
mysql> SELECT * FROM oqituvchilar right JOIN qismlar ON oqituvchilar.xodim_id = qismlar.qism_id 
union SELECT * FROM oqituvchilar left JOIN qismlar ON oqituvchilar.xodim_id = qismlar.qism_id; 

---

+----------+-------------+--------------+------------------+---------+--------------------+------------------+---------+---
---------------+-------------------------------------------------------------------+---------------+-----------------+--------
-----------+ 
| xodim_id | ism | familiya | ishga_kirgan_yil | maosh | lavozim | ish vaqti (soat) | qism_id | 
qism_nomi | qism_vazifasi | xodimlar_soni | mashinalar_soni | 
nazoratchi_xodim | 
+----------+-------------+--------------+------------------+---------+--------------------+------------------+---------+---
---------------+-------------------------------------------------------------------+---------------+-----------------+--------
-----------+ 
| 1 | Islomjon | Ismoilov | 2017 | 5000000 | direktor | 8 | 1 | Buxa nka non 
sexi | Buxanka non, qora non, baton, kabi maxsulotlarni ishlab chiqarish | 12 | 6 | Behruz 
Keldiyev | 
| 2 | Otabek | Tursunov | 2017 | 2500000 | sifat nazoratchisi | 8 | 2 | Pech eniye 
sexi | Pecheniye maxsulotlarni ishlab chiqarish | 12 | 6 | Behruz Keldiyev | 
| 3 | Akmaljon | Nosiraliyev | 2017 | 2500000 | sifat nazoratchisi | 8 | 3 | Pishiriq 
sexi | Tort, keks, pirog, kabi maxsulotlarni ishlab chiqarish | 14 | 7 | Abduvohid 
Komilov | 
| 4 | Behruz | Keldiyev | 2017 | 2200000 | ishchi xodim | 8 | 4 | Pish irish 
pechi | Barcha sexlardan chiqqan maxsulotlarni pishirish | 18 | 9 | Abduvohid 
Komilov | 
| 5 | Abduvohid | Komilov | 2017 | 2200000 | ishchi xodim | 8 | NULL | 
NULL | NULL 
| NULL | NULL | NULL | 
| 6 | Shahriyor | Abdulhamidov | 2017 | 2000000 | mexanik | 8 | NULL | 
NULL | NULL 
| NULL | NULL | NULL | 
| 7 | Nodirbek | Mahamadjonov | 2017 | 2000000 | mexanik | 8 | NULL | 
NULL | NULL 
| NULL | NULL | NULL | 
| 8 | MuhammadAli | Rayimjonov | 2017 | 3000000 | nazoratchi | 8 | NULL | 
NULL | NULL 
| NULL | NULL | NULL | 
+----------+-------------+--------------+------------------+---------+--------------------+------------------+---------+---
---------------+-------------------------------------------------------------------+---------------+-----------------+--------
-----------+ 
8 rows in set (0.00 sec)