City jadavalini yarating unda (id, city, country, postcode) bo'lsin

1. 
   city jadavalini yarating. unda (id, city, country, postcode) bo'lsin.
   

1.1 city jadavaliga 10 element qoshing.

1.2 city jadavalidan country = "country1" ga tegishli elementlarni to'plang.

2. 
   books jadavalini yarating. unda (id, name, author, category, price) bo'lsin.
   

1. 
   books jadavaliga 10 element qoshing.
   

2. 
   books jadavalidan author = "author1" ga tegishli elementlarni to'plang.
   

3. 
   user jadavalini yarating. unda (id, first_name, last_name, age) bo'lsin.
   

3.1. user jadvalidan 25 yoshga teng bo'lgan userlarni hamma malumotini oling?

3.2. user jadvalidan 25 yoshga teng bo'lgan userlarni first_name va age malumotlarini oling?

3.3. user jadvalidan id = 3 bo'lgan userni first_name va last_name malumotlarini oling?