init repository

Practice/prac1.sql

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+DROP TABLE IF EXISTS professors;
+
+CREATE table professors(
+    id integer PRIMARY KEY,
+    first_name varchar(20) NOT NULL,
+    last_name varchar(20) NOT NULL,
+    sec_name varchar(20),
+    salary integer CHECK(salary <= 900000) NOT NULL,
+    subj varchar(20) default 'Общая практика',
+    work_exp integer CHECK(work_exp >= 0),
+    dep varchar(2)
+);
+
+INSERT into professors VALUES 
+(1, 'Rob', 'Ivanov', 'Ivanovich', 34000, default, 3, '75'),
+(2, 'Vasiliy', 'Vasilyev', 'Vasilyevich', 874000, 'TMP', 12, 42),
+(3, 'Сергей', 'Егоров', 'Артемьевич', 37879, default, 2, 33),
+(4, 'Егор', 'Медведев', 'Кириллович', 34000, default, 3, '75'),
+(5, 'Андрей', 'Смирнов', ' Александрович', 554000, 'TMP', 6, 72),
+(6, 'Андрей', 'Егоров', 'Артемьевич', 37879, default, 2, 83),
+(7, 'Rob', 'Ivanov', 'Ivanovich', 34000, default, 6, '75'),
+(8, 'Vasiliy', 'Vasilyev', 'Vasilyevich', 874000, 'TMP', 12, 49),
+(9, 'Петр', 'Сергеев', 'Артемьевич', 349583, default, 3, 43),
+(10, 'Егор', 'Вакутагин', 'Артемьевич', 35669, default, 2, 33);
+
+
+/*SELECT last_name, first_name FROM professors;*/
+SELECT first_name, last_name AS last_name, first_name FROM professors;
+
+DROP table professors;
+
+SELECT * FROM professors;

Practice/prac2.sql

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+CREATE table students(
+  id integer primary key,
+  f_name varchar(20) NOT NULL,
+  l_name varchar(20) NOT NULL,
+  age integer CHECK(age >= 18) NOT NULL,
+  grp char(7) NOT NULL,
+  code_spec char(8)
+);
+
+INSERT into students VALUES 
+(1, 'Vasya', 'Pupkin', 20, 'C21-712', '10.05.04'),
+(2, 'Vasya', 'Pupkin', 20, 'C21-712', '10.05.04'),
+(3, 'Ivan', 'Ivanov', 30, 'A12-456', '15.06.11'),
+(4, 'Sasha', 'Smirnova', 19, 'C12-987', '11.07.08'),
+(5, 'Natasha', 'Nikitina', 28, 'D21-654', '03.03.10'),
+(6, 'Nikita', 'Orlov', 23, 'E11-345', '19.08.05'),
+(7, 'Olga', 'Petrova', 22, 'F22-876', '22.05.12'),
+(8, 'Elena', 'Efimova', 33, 'G11-234', '13.09.01');
+
+/*SELECT f_name AS l_name, l_name AS f_name, age AS grp, grp AS age,code_spec
+FROM students;*/
+
+ALTER TABLE students ADD gender char(1);
+
+ALTER TABLE students ADD CONSTRAINT gender SET UNIQUE;
+
+INSERT into students VALUES 
+(1, 'Vasya', 'Pupkin', 20, 'C21-712', '10.05.04', 'm');
+
+SELECT * FROM students;