Base SQL homework

aharlamcev/postgresql/BaseSQLhomework.sql

@@ -0,0 +1,28 @@
+select * from users
+
+select id, name, country from users
+order by name;
+
+select id, name, country, created_at from users 
+where country = 'KZ'
+order by created_at desc;
+
+select id, name from users 
+where email is null;
+
+select id, name from users 
+where email is not null;
+
+update users 
+set email = 'alice@mail.com'
+where name = 'Alice';     -- в моей таблице ни у кого нет email, добавил чтобы посмотреть.
+
+select id, name, UPPER(email) as email_upper from users;
+
+select id, name, LOWER(email) as email_lower from users 
+where email is not null;
+
+select id, name, created_at from users 
+where created_at > '2024-01-11'
+order by created_at desc 
+limit 2;