SpirirHost Support Centre: MySQL Reference Manual p.165

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Table of Contents
1. General Information
2. MySQL Installation
3. Tutorial Introduction
4. Database Administration
5. MySQL Optimisation
6. MySQL Language Reference
7. MySQL Table Types
8. MySQL APIs
9. Extending MySQL

Chapter 3: Tutorial Introduction 165 +---------+------+----------+ | cat | f | 1 | | cat | m | 1 | | dog | f | 1 | | dog | m | 2 | +---------+------+----------+ Or, if you wanted the number of animals per sex only for known-sex animals: mysql> SELECT species, sex, COUNT(*) FROM pet -> WHERE sex IS NOT NULL -> GROUP BY species, sex; +---------+------+----------+ | species | sex | COUNT(*) | +---------+------+----------+ | bird | f | 1 | | cat | f | 1 | | cat | m | 1 | | dog | f | 1 | | dog | m | 2 | | hamster | f | 1 | | snake | m | 1 | +---------+------+----------+ 3.3.4.9 Using More Than one Table The pet table keeps track of which pets you have. If you want to record other information about them, such as events in their lives like visits to the vet or when litters are born, you need another table. What should this table look like? It needs: To contain the pet name so you know which animal each event pertains to. A date so you know when the event occurred. A eld to describe the event. An event type eld, if you want to be able to categorise events. Given these considerations, the CREATE TABLE statement for the event table might look like this: mysql> CREATE TABLE event (name VARCHAR(20), date DATE, -> type VARCHAR(15), remark VARCHAR(255)); As with the pet table, it's easiest to load the initial records by creating a tab-delimited text le containing the information: name date type remark Fluy 1995-05-15 litter 4 kittens, 3 female, 1 male Buy 1993-06-23 litter 5 puppies, 2 female, 3 male Buy 1994-06-19 litter 3 puppies, 3 female Chirpy 1999-03-21 vet needed beak straightened Slim 1997-08-03 vet broken rib Bowser 1991-10-12 kennel

MySQL Reference Manual

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