MySQL 8.0 Reference Manual
MySQL 8.0 Release Notes
Table of Contents
- 7.1 The Maximum Value for a Column
- 7.2 The Row Holding the Maximum of a Certain Column
- 7.3 Maximum of Column per Group
- 7.4 The Rows Holding the Group-wise Maximum of a Certain Column
- 7.5 Using User-Defined Variables
- 7.6 Using Foreign Keys
- 7.7 Searching on Two Keys
- 7.8 Calculating Visits Per Day
- 7.9 Using AUTO_INCREMENT
Here are examples of how to solve some common problems with MySQL.
Some of the examples use the table shop
to hold
the price of each article (item number) for certain traders
(dealers). Supposing that each trader has a single fixed price per
article, then (article
,
dealer
) is a primary key for the records.
Start the command-line tool mysql and select a database:
$> mysql your-database-name
To create and populate the example table, use these statements:
CREATE TABLE shop (
article INT UNSIGNED DEFAULT '0000' NOT NULL,
dealer CHAR(20) DEFAULT '' NOT NULL,
price DECIMAL(16,2) DEFAULT '0.00' NOT NULL,
PRIMARY KEY(article, dealer));
INSERT INTO shop VALUES
(1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.45),
(3,'C',1.69),(3,'D',1.25),(4,'D',19.95);
After issuing the statements, the table should have the following contents:
SELECT * FROM shop ORDER BY article;
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
| 1 | A | 3.45 |
| 1 | B | 3.99 |
| 2 | A | 10.99 |
| 3 | B | 1.45 |
| 3 | C | 1.69 |
| 3 | D | 1.25 |
| 4 | D | 19.95 |
+---------+--------+-------+