project 1 - display value (sql)

CREATE TABLE user0
(
Dname VARCHAR(100) UNIQUE NOT NULL,
Dpassword VARCHAR(100) NOT NULL
);

CREATE TABLE data0
(
Dbrand VARCHAR(100) NOT NULL,
Dmodel VARCHAR(100) NOT NULL,
Ddescription VARCHAR(10000) NOT NULL,
Dprice DECIMAL(20,4) UNSIGNED NOT NULL
);

INSERT INTO user0(Dname,Dpassword)
VALUES ("alvi","alvi");
INSERT INTO user0(Dname,Dpassword)
VALUES ("zafir",SHA1("alvi"));

INSERT INTO data0(Dbrand,Dmodel,Ddescription,Dprice)
VALUES("a0","b0","c0",20.0);
INSERT INTO data0(Dbrand,Dmodel,Ddescription,Dprice)
VALUES("a1","b1","c1",21.1);
INSERT INTO data0(Dbrand,Dmodel,Ddescription,Dprice)
VALUES("a2","b2","c2",22.2);
INSERT INTO data0(Dbrand,Dmodel,Ddescription,Dprice)
VALUES("a3","b3","c3",23.3);
INSERT INTO data0(Dbrand,Dmodel,Ddescription,Dprice)
VALUES("a4","b4","c4",24.4);