reboot rep

3 sem/Practice/prac2.sql

@@ -0,0 +1,30 @@
+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;