Been trying to perform an insert into command for a table called customers. However whenever I try to do a query I get the following error.
Error Code: 1364. Field 'customer_address' doesn't have a default value 0.000 sec
I'm not entirely sure how I would go about setting a default value. Any suggestions?
lock table customers write;
set foreign_key_checks = 0;
alter table customers modify customer_id integer auto_increment;
insert into customers (customer_first_name, customer_last_name)
values ("Nathan", "Rivera"),
("thom", "something");
Here is the script used to create my table
-- *************************************************************
-- This script creates the database
-- **REVISED by PRP to remove some orders
-- **REVISED by PRP to add artist table
-- **REVISED by PRP to link employee table to orders
-- *************************************************************
DROP TABLE IF EXISTS customers;
DROP TABLE IF EXISTS orders;
DROP TABLE IF EXISTS order_details;
DROP TABLE IF EXISTS items;
DROP TABLE IF EXISTS artists;
DROP TABLE IF EXISTS employees;
-- create tables
CREATE TABLE customers
(
customer_id INT ,
customer_first_name VARCHAR(20),
customer_last_name VARCHAR(20) NOT NULL,
customer_address VARCHAR(50) NOT NULL,
customer_city VARCHAR(20) NOT NULL,
customer_state CHAR(2) NOT NULL,
customer_zip CHAR(5) NOT NULL,
customer_phone CHAR(10) NOT NULL,
customer_fax CHAR(10),
CONSTRAINT customers_pk
PRIMARY KEY (customer_id)
);
CREATE TABLE artists
(
artist_id INT NOT NULL,
artist_name VARCHAR(30),
CONSTRAINT artist_pk
PRIMARY KEY (artist_id)
);
CREATE TABLE items
(
item_id INT NOT NULL,
title VARCHAR(50) NOT NULL,
artist_id INT NOT NULL,
unit_price DECIMAL(9,2) NOT NULL,
CONSTRAINT items_pk
PRIMARY KEY (item_id),
CONSTRAINT items_fk_artists
FOREIGN KEY (artist_id) REFERENCES artists (artist_id)
);
CREATE TABLE employees
(
employee_id INT NOT NULL,
last_name VARCHAR(20) NOT NULL,
first_name VARCHAR(20) NOT NULL,
manager_id INT
,
CONSTRAINT employees_pk
PRIMARY KEY (employee_id),
CONSTRAINT emp_fk_mgr FOREIGN KEY (manager_id) REFERENCES employees(employee_id) );
CREATE TABLE orders
(
order_id INT NOT NULL,
customer_id INT NOT NULL,
order_date DATE NOT NULL,
shipped_date DATE,
employee_id INT,
CONSTRAINT orders_pk
PRIMARY KEY (order_id),
CONSTRAINT orders_fk_customers
FOREIGN KEY (customer_id) REFERENCES customers (customer_id),
CONSTRAINT orders_fk_employees
FOREIGN KEY (employee_id) REFERENCES employees (employee_id)
);
CREATE TABLE order_details
(
order_id INT NOT NULL,
item_id INT NOT NULL,
order_qty INT NOT NULL,
CONSTRAINT order_details_pk
PRIMARY KEY (order_id, item_id),
CONSTRAINT order_details_fk_orders
FOREIGN KEY (order_id)
REFERENCES orders (order_id),
CONSTRAINT order_details_fk_items
FOREIGN KEY (item_id)
REFERENCES items (item_id)
);
-- insert rows into tables
INSERT INTO customers VALUES
(1,'Korah','Blanca','1555 W Lane Ave','Columbus','OH','43221','6145554435','6145553928'),
(2,'Yash','Randall','11 E Rancho Madera Rd','Madison','WI','53707','2095551205','2095552262'),
(3,'Johnathon','Millerton','60 Madison Ave','New York','NY','10010','2125554800',NULL),
(4,'Mikayla','Davis','2021 K Street Nw','Washington','DC','20006','2025555561',NULL),
(5,'Kendall','Mayte','4775 E Miami River Rd','Cleves','OH','45002','5135553043',NULL),
(6,'Kaitlin','Hostlery','3250 Spring Grove Ave','Cincinnati','OH','45225','8005551957','8005552826'),
(7,'Derek','Chaddick','9022 E Merchant Wy','Fairfield','IA','52556','5155556130',NULL),
(8,'Deborah','Davis','415 E Olive Ave','Fresno','CA','93728','5595558060',NULL),
(9,'Karina','Lacy','882 W Easton Wy','Los Angeles','CA','90084','8005557000',NULL),
(10,'Kurt','Nickalus','28210 N Avenue Stanford','Valencia','CA','91355','8055550584','055556689'),
(11,'Kelsey','Eulalia','7833 N Ridge Rd','Sacramento','CA','95887','2095557500','2095551302'),
(12,'Anders','Rohansen','12345 E 67th Ave NW','Takoma Park','MD','24512','3385556772',NULL),
(13,'Thalia','Neftaly','2508 W Shaw Ave','Fresno','CA','93711','5595556245',NULL),
(14,'Gonzalo','Keeton','12 Daniel Road','Fairfield','NJ','07004','2015559742',NULL),
(15,'Ania','Irvin','1099 N Farcourt St','Orange','CA','92807','7145559000',NULL),
(16,'Dakota','Baylee','1033 N Sycamore Ave.','Los Angeles','CA','90038','2135554322',NULL),
(17,'Samuel','Jacobsen','3433 E Widget Ave','Palo Alto','CA','92711','4155553434',NULL),
(18,'Justin','Javen','828 S Broadway','Tarrytown','NY','10591','8005550037',NULL),
(19,'Kyle','Marissa','789 E Mercy Ave','Phoenix','AZ','85038','9475553900',NULL),
(20,'Erick','Kaleigh','Five Lakepointe Plaza, Ste 500','Charlotte','NC','28217','7045553500',NULL),
(21,'Marvin','Quintin','2677 Industrial Circle Dr','Columbus','OH','43260','6145558600','6145557580'),
(22,'Rashad','Holbrooke','3467 W Shaw Ave #103','Fresno','CA','93711','5595558625','5595558495'),
(23,'Trisha','Anum','627 Aviation Way','Manhatttan Beach','CA','90266','3105552732',NULL),
(24,'Julian','Carson','372 San Quentin','San Francisco','CA','94161','6175550700',NULL),
(25,'Kirsten','Story','2401 Wisconsin Ave NW','Washington','DC','20559','2065559115',NULL);
INSERT INTO artists(artist_id,artist_name) VALUES
(10, 'Umani'),
(11, 'The Ubernerds'),
(12, 'No Rest For The Weary'),
(13, 'Burt Ruggles'),
(14, 'Sewed the Vest Pocket'),
(15, 'Jess & Odie'),
(16, 'Onn & Onn');
INSERT INTO items (item_id,title,artist_id,unit_price) VALUES
(1,'Umami In Concert',10,17.95),
(2,'Race Car Sounds',11,13),
(3,'No Rest For The Weary',12,16.95),
(4,'More Songs About Structures and Comestibles',12,17.95),
(5,'On The Road With Burt Ruggles',13,17.5),
(6,'No Fixed Address',14,16.95),
(7,'Rude Noises',15,13),
(8,'Burt Ruggles: An Intimate Portrait',13,17.95),
(9,'Zone Out With Umami',10,16.95),
(10,'Etcetera',16,17);
INSERT INTO employees VALUES
(1,'Smith', 'Cindy', null),
(2,'Jones', 'Elmer', 1),
(3,'Simonian', 'Ralph', 2),
(9,'Locario', 'Paulo',1),
(8,'Leary', 'Rhea',9),
(4,'Hernandez','Olivia',9),
(5,'Aaronsen', 'Robert',4),
(6,'Watson', 'Denise',8),
(7,'Hardy', 'Thomas',2);
INSERT INTO orders VALUES
(19, 1, '2012-10-23', '2012-10-28', 6),
(29, 8, '2012-11-05', '2012-11-11', 6),
(32, 11, '2012-11-10', '2012-11-13', NULL),
(45, 2, '2012-11-25', '2012-11-30', NULL),
(70, 10, '2012-12-28', '2013-01-07', 5),
(89, 22, '2013-01-20', '2013-01-22', 7),
(97, 20, '2013-01-29', '2013-02-02', 5),
(118, 3, '2013-02-24', '2013-02-28', 7),
(144, 17, '2013-03-21', '2013-03-29', NULL),
(158, 9, '2013-04-04', '2013-04-20', NULL),
(165, 14, '2013-04-11', '2013-04-13', NULL),
(180, 24, '2013-04-25', '2013-05-30', NULL),
(231, 15, '2013-06-14', '2013-06-22', NULL),
(242, 23, '2013-06-24', '2013-07-06', 3),
(264, 9, '2013-07-15', '2013-07-18', 6),
(298, 18, '2013-08-18', '2013-09-22', 3),
(321, 2, '2013-09-09', '2013-10-05', 6),
(381, 7, '2013-11-08', '2013-11-16', 7),
(413, 17, '2013-12-05', '2014-01-11', 7),
(442, 5, '2013-12-28', '2014-01-03', 5),
(479, 1, '2014-01-30', '2014-03-03', 3),
(491, 16, '2014-02-08', '2014-02-14', 5),
(523, 3, '2014-03-07', '2014-03-15', 3),
(548, 2, '2014-03-22', '2014-04-18', NULL),
(550, 17, '2014-03-23', '2014-04-03', NULL),
(601, 16, '2014-04-21', '2014-04-27', NULL),
(607, 20, '2014-04-25', '2014-05-04', NULL),
(624, 2, '2014-05-04', '2014-05-09', NULL),
(627, 17, '2014-05-05', '2014-05-10', NULL),
(630, 20, '2014-05-08', '2014-05-18', 7),
(651, 12, '2014-05-19', '2014-06-02', 7),
(658, 12, '2014-05-23', '2014-06-02', 7),
(687, 17, '2014-06-05', '2014-06-08', NULL),
(693, 9, '2014-06-07', '2014-06-19', NULL),
(703, 19, '2014-06-12', '2014-06-19', 7),
(778, 13, '2014-07-12', '2014-07-21', 7),
(796, 17, '2014-07-19', '2014-07-26', 5),
(800, 19, '2014-07-21', '2014-07-28', NULL),
(802, 2, '2014-07-21', '2014-07-31', NULL),
(824, 1, '2014-08-01', NULL, NULL),
(827, 18, '2014-08-02', NULL, NULL),
(829, 9, '2014-08-02', NULL, NULL);
INSERT INTO order_details VALUES
(381,1,1),(601,9,1),
(442,1,1),
(523,9,1),
(630,5,1),
(778,1,1),
(693,10,1),
(118,1,1),
(264,7,1),
(607,10,1),
(624,7,1),
(658,1,1),
(800,5,1),
(158,3,1),
(321,10,1),
(687,6,1),
(827,6,1),
(144,3,1),
(479,1,2),
(630,6,2),(796,5,1),(97,4,1),
(601,5,1),
(800,1,1),
(29,10,1),
(70,1,1),
(165,4,1),
(180,4,1),
(231,10,1),
(413,10,1),
(491,6,1),
(607,3,1),
(651,3,1),
(703,4,1),
(802,3,1),
(824,7,2),
(829,1,1),
(550,4,1),
(796,7,1),
(693,6,1),
(29,3,1),
(32,7,1),
(242,1,1),
(298,1,1),
(479,4,1),
(548,9,1),
(627,9,1),
(778,3,1),
(19,5,1),
(89,4,1),
(242,6,1),
(264,4,1),
(550,1,1),
(693,7,3),
(824,3,1),
(829,5,1),
(829,9,1);
Error Code: 1364. Field 'customer_address' doesn't have a default value 0.000 sec
That means that the customer_address column is set to NOT allow NULL values and that no default value has been specified. Therefore your insert statement must include the customer address field.
insert into customers (customer_first_name, customer_last_name, customer_address)
values ("Nathan", "Rivera", "1000 Fred St."),
("thom", "something", "9659 Foobar Dr.");
Now that you've added your table defs it's clear that you'll need the other fields that you've marked NOT NULL as well in the insert statement, or you'll see a similar error for each one you leave out.
You can specify a default value using the DEFAULT option in the CREATE TABLE query.
CREATE TABLE customers
(
customer_id INT,
customer_first_name VARCHAR(20),
customer_last_name VARCHAR(20) NOT NULL,
customer_address VARCHAR(50) NOT NULL DEFAULT '',
customer_city VARCHAR(20) NOT NULL DEFAULT '',
customer_state CHAR(2) NOT NULL DEFAULT '',
customer_zip CHAR(5) NOT NULL DEFAULT '',
customer_phone CHAR(10) NOT NULL DEFAULT '',
customer_fax CHAR(10),
CONSTRAINT customers_pk
PRIMARY KEY (customer_id)
);
So, this is my code. When I attempt to compile it in the school provided engine, I've gotten a couple errors, and they do change each time I run it, but the one I currently have is this:
ERROR 1064 (42000) at line 123: You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for the
right syntax to use near '9:30, 'L210', 103, 15), (86, 25, 2,
6/10/2007 9:30, 'L210', 107, 15), (89, 25, 5' at line 2
I've already tried to take out the spaces, but it makes no difference. Would this have anything to do with the order in which I take information? Or is it something else?
I'm also not sure that the tables are dropping at step one.
/*Step One: Drop Tables*/
DROP TABLE IF EXISTS Student;
DROP TABLE IF EXISTS Zipcode;
DROP TABLE IF EXISTS Instructor;
DROP TABLE IF EXISTS Enrollment;
DROP TABLE IF EXISTS Sections;
DROP TABLE IF EXISTS Course;
/*Step Two: Create Tables*/
CREATE TABLE Zipcode
(
zip int(11),
city varchar(25) NOT NULL,
state varchar(2) NOT NULL,
PRIMARY KEY (zip)
);
CREATE TABLE Student
(
student_ID int(6) UNIQUE,
salutation varchar(5),
first_name varchar(25) NOT NULL,
last_name varchar(25) NOT NULL,
street_address varchar(50),
phone int(15) NOT NULL,
employer varchar(50) ,
registration_date date NOT NULL,
zip int(11),
PRIMARY KEY (student_ID),
FOREIGN KEY (zip) REFERENCES Zipcode (zip)
);
CREATE TABLE Course
(
course_ID int(6) UNIQUE,
description varchar(50) NOT NULL,
cost dec(8,2) NOT NULL,
prerequisite int(6),
PRIMARY KEY (course_ID),
FOREIGN KEY (prerequisite) REFERENCES Course (course_ID)
);
CREATE TABLE Instructor
(
Instructor_ID int(6) UNIQUE,
salutation varchar(5),
first_name varchar(25) NOT NULL,
last_name varchar(25) NOT NULL,
street_address varchar(50),
zip int(11) NOT NULL,
PRIMARY KEY (Instructor_ID),
FOREIGN KEY (zip) REFERENCES zipcode (zip)
);
CREATE TABLE Sections
(
section_ID int(8) UNIQUE,
course_id int(6) NOT NULL,
course_section_num int(6) NOT NULL,
start_date_time datetime NOT NULL,
location varchar(10),
instructor_ID int(6) NOT NULL,
capacity int(3),
PRIMARY KEY (section_ID),
FOREIGN KEY (instructor_ID) REFERENCES Instructor (instructor_ID),
FOREIGN KEY (course_ID) REFERENCES Course (course_ID)
);
CREATE TABLE Enrollment
(
student_ID int(6) UNIQUE,
section_ID int(8) UNIQUE,
enroll_date datetime NOT NULL,
final_grade char(1),
PRIMARY KEY (section_ID, student_ID),
FOREIGN KEY (section_ID) REFERENCES sections (section_ID),
FOREIGN KEY (student_ID) REFERENCES student (student_ID)
);
/*Step Three: Insert Rows*/
INSERT INTO Zipcode VALUES
(7024, 'Ft. Lee', 'NJ'),
(7047, 'North Bergen', 'NJ'),
(10005, 'New York', 'NY'),
(10015, 'New York', 'NY'),
(10025, 'New York', 'NY'),
(10035, 'New York', 'NY'),
(11419, 'Richmond Hill', 'NY'),
(11435, 'Jamaica', 'NY');
INSERT INTO Student VALUES
(102, 'Mr.', 'Fred', 'Crocitto', '101-09 120th St.', 718-555-5555, 'Albert Hildegard Co.', 1/22/2007, 11419),
(103, 'Ms.', 'J.', 'Landry', '7435 Boulevard East #45', 201-555-5555, 'Albert Hildegard Co.', 1/22/2007, 7047),
(104, 'Ms.', 'Laetia', 'Enison', '144-61 87th Ave', 718-555-5555, 'Albert Hildegard Co.', 1/22/2007, 11435),
(105, 'Mr.', 'Angel', 'Moskowitz', '320 John St.', 201-555-5555, 'Alex. & Alexander', 1/22/2007, 7024),
(163, 'Ms.', 'Nicole', 'Gillen', '4301 N Ocean #103', 904-555-5555, 'Oil of America Corp.', 2/2/2007, 10025),
(223, 'Mr.', 'Frank', 'Pace', '13 Burlington Dr.', 203-555-5555, 'Board Utilities', 2/8/2007, 10025),
(399, 'Mr.', 'Jerry', 'Abdou', '460 15th St. #4', 718-555-5555, 'Health Mgmt.Systems', 2/23/2007, 10025);
INSERT INTO Course VALUES
(330, 'Network Administration', 1195, 130),
(310, 'Operating Systems', 1195, NULL),
(142, 'Project Management', 1195, 20),
(140, 'Systems Analysis', 1195, 20),
(130, 'Intro to Unix', 1195, 310),
(25, 'Intro to Programming', 1195, 140),
(20, 'Intro to Information Systems', 1195, NULL);
INSERT INTO Instructor VALUES
(101, 'Mr.', 'Fernand', 'Hanks', '100 East 87th', 10015),
(102, 'Mr.', 'Tom', 'Wojick', '518 West 120th', 10025),
(103, 'Ms.', 'Nina', 'Schorin', '210 West 101st', 10025),
(104, 'Mr.', 'Gary', 'Pertez', '34 Sixth Ave', 10035),
(105, 'Ms.', 'Anita', 'Morris', '34 Maiden Lane', 10015),
(106, 'Rev.', 'Todd', 'Smythe', '210 West 101st', 10025),
(107, 'Dr.', 'Marilyn', 'Frantzen', '254 Bleeker', 10005);
INSERT INTO Sections VALUES
(81, 20, 2, 7/24/2007 9:30, 'L210', 103, 15),
(86, 25, 2, 6/10/2007 9:30, 'L210', 107, 15),
(89, 25, 5, 5/15/2007 9:30, 'L509', 103, 25),
(92, 25, 8, 6/13/2007 9:30, 'L509', 106, 25),
(104, 330, 1, 7/14/2007 10:30, 'L511', 104, 25),
(119, 142, 1, 7/14/2007 9:30, 'L211', 103, 25),
(155, 122, 4, 5/4/2007 9:30, 'L210', 107, 15);
INSERT INTO Enrollment VALUES
(102, 86, 1/30/2007, NULL, 'B'),
(102, 89, 1/30/2007, 92,'A'),
(103, 81, 1/30/2007, NULL),
(104, 81, 1/30/2007, NULL, 'A'),
(163, 92, 2/10/2007, NULL),
(223, 104, 2/16/2007, NULL,'C'),
(223, 119, 2/16/2007, NULL);
/*Step Four: Select Statements*/
SELECT * FROM Student;
SELECT * FROM Zipcode;
SELECT * FROM Instructor;
SELECT * FROM Course;
SELECT * FROM Sections;
SELECT * FROM Enrollment;
The issue identified by the error message is the datetime literal, here:
INSERT INTO Sections VALUES
(81, 20, 2, 7/24/2007 9:30, 'L210', 103, 15)
^^^^^^^^^^^^^^
To get a value assigned to a datetime column, you could do this:
(81, 20, 2, '2007-07-24 09:30', 'L210', 103, 15)
^^^^^^^^^^^^^^^^^^
Datetime literals should be enclosed in single quotes, and represented in a format like 'YYYY-MM-DD' or 'YYYY-MM-DD HH:MI:SS'.
(It is also possible to pass numeric decimal values in. But no one really does that. Just use a string literal in the correct format. I believe newer versions of MySQL are more lenient than earlier versions, regarding the strictness of two characters for month, and two characters for day, and using a delimiter other than the dash. I think its also possible to omit the delimiter for a datetime
I think MySQL would also accept something like this:
'20070724093000'
But again, no one really does that. Just supply the values as strings in the standard 'YYYY-MM-DD HH:MI:SS' format.
I am learning MySQL and I currently do not understand how to do something.
I have two tables and I want to display some stuff out of it, it's pretty hard to explain so I'd rather show you.
These are my tables:
CREATE TABLE IF NOT EXISTS `proprietate` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`serie_buletin` varchar(8) NOT NULL,
`cnp` bigint(20) NOT NULL,
`nr_vehicul` int(11) NOT NULL,
`data_cumpararii` date NOT NULL,
`pret` int(11) NOT NULL,
`id_persoana` int(11) NOT NULL,
PRIMARY KEY (id),
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=16 ;
CREATE TABLE IF NOT EXISTS `vehicul` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`nr_vehicul` int(11) NOT NULL,
`marca` varchar(30) NOT NULL,
`id_marca` int(11) NOT NULL,
`tip` varchar(15) NOT NULL,
`culoare` varchar(15) NOT NULL,
`capacitate_cilindrica` int(11) NOT NULL,
`id_proprietate` int(11) NOT NULL,
PRIMARY KEY (id),
FOREIGN KEY (id_proprietate) REFERENCES proprietate(id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=16 ;
And these are my values inside my tables:
INSERT INTO `proprietate` (`id`, `serie_buletin`, `cnp`, `nr_vehicul`, `data_cumpararii`, `pret`, `id_persoana`) VALUES
(1, 'AK162332', 2006036035087, 4, '2014-05-01', 35000, 1),
(2, 'AK162332', 2006036035087, 10, '2014-05-02', 90000, 2),
(3, 'AK176233', 6548751520125, 2, '2014-05-03', 55000, 3),
(4, 'BZ257743', 6548751520125, 2, '2014-05-04', 25000, 4),
(5, 'BZ257743', 2006036035087, 15, '2014-05-05', 63000, 5),
(6, 'DC456542', 2003564784513, 7, '2014-05-06', 30000, 6),
(7, 'EN654872', 2012654879521, 6, '2014-05-07', 50000, 7);
INSERT INTO `vehicul` (`id`, `nr_vehicul`, `marca`, `id_marca`, `tip`, `culoare`, `capacitate_cilindrica`, `id_proprietate`) VALUES
(1, 4, 'Mercedes', 1, 'CLK 350', 'negru', 3500, 1),
(2, 10, 'Mercedes', 1, 'S 500', 'silver', 5000, 2),
(3, 2, 'Mercedes', 1, 'ML 550', 'alb', 5500, 3),
(4, 2, 'BMW', 2, '325', 'galben', 2500, 4),
(5, 15, 'BMW', 2, 'X5', 'negru', 3500, 5),
(6, 7, 'Audi', 3, 'R5', 'mov', 5000, 6),
(7, 6, 'Audi', 3, 'Q5', 'metalic', 3000, 7);
What I want to display is:
marca | nr_vehicul | average_price
Audi | 13 | 40000
BMW | 17 | 44000
Mercedes | 16 | 60000
How can I do that? So far I have managed to display the first two columns but I have no idea how to reference the first table in the second and calculate the average price.
This is what I have so far:
SELECT marca, SUM(nr_vehicul) AS nr_vehicul FROM vehicul GROUP BY marca
Can anyone help me please?
You should join your tables to get combined information from both of them:
SELECT marca, SUM(vehicul.nr_vehicul) AS nr_vehicul, avg(pret) as pret
FROM vehicul
LEFT OUTER JOIN proprietate on (id_proprietate = proprietate.id)
GROUP BY marca;
see this sql fiddle session for the output.
First you select the data (column names with appropriate functions used) you need: marca, SUM(vehicul.nr_vehicul), AVG(pret), then you construct the joined structure from where mysql should retrieve these informations: vehicul, proprietate.
For this structure you need primarily the vehicul table, by which you will group the result set. You want to join the proprietate table to the vehicul table properly, to make sure the correct data structure is created. Since you have foreign key from one table to the other, the easiest way to do it is to use that key: LEFT OUTER JOIN proprietate on (id_proprietate = proprietate.id).
For more information on understanding the different JOIN types, please see this article by Craig Buckler.
$query = "SELECT type, AVG(pret) FROM vehicul GROUP BY marca";
$result = mysql_query($query) or die(mysql_error());
// Print out result
while($row = mysql_fetch_array($result)){
echo "The average price of ". $row['type']. " is $".$row['AVG(price)'];}</code>
should return the average price per marca