CREATE TABLE test_tbl (
    u_name varchar NOT NULL,
    u_color varchar NULL
);
 
INSERT INTO test_tbl (u_name, u_color) values ('Ivanov', 'RED');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'YELLOW');
INSERT INTO test_tbl (u_name, u_color) values ('Ivanov', 'RED');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'YELLOW');
INSERT INTO test_tbl (u_name, u_color) values ('Ivanov', 'GREEN');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'PERFECT');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'RED');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'GREEN');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'GREEN');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'YELLOW');
INSERT INTO test_tbl (u_name, u_color) values ('Ivanov', 'RED');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'PERFECT');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'PERFECT');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'YELLOW');
INSERT INTO test_tbl (u_name, u_color) values ('Ivanov', 'GREEN');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'RED');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'RED');
INSERT INTO test_tbl (u_name, u_color) values ('Petrov', 'GREEN');
INSERT INTO test_tbl (u_name, u_color) values ('Ivanov', 'YELLOW');
INSERT INTO test_tbl (u_name, u_color) values ('Sidorov', 'RED');