ErwanCheriaux / sql

Apprentissage de SQL avec le SGBDR MySLQ.

SHOW

SHOW tables;

Tables_in_elevage
Animal
Espece
Race

DESCRIBE

DESCRIBE Animal;

Field	Type	Null	Key	Default	Extra
id	smallint(6) unsigned	NO	PRI	NULL	auto_increment
sexe	char(1)	YES		NULL
date_naissance	datetime	NO		NULL
nom	varchar(30)	YES	MUL	NULL
commentaires	text	YES		NULL
espece_id	smallint(5) unsigned	NO	MUL	NULL
race_id	smallint(5) unsigned	YES	MUL	NULL
mere_id	smallint(5) unsigned	YES	MUL	NULL
pere_id	smallint(5) unsigned	YES	MUL	NULL

DESCRIBE Espece;

Field	Type	Null	Key	Default	Extra
id	smallint(5) unsigned	NO	PRI	NULL	auto_increment
nom_courant	varchar(40)	NO		NULL
nom_latin	varchar(40)	NO	UNI	NULL
description	text	YES		NULL

DESCRIBE Race;

Field	Type	Null	Key	Default	Extra
id	smallint(5) unsigned	NO	PRI	NULL	auto_increment
nom	varchar(40)	NO		NULL
espece_id	smallint(5) unsigned	NO	MUL	NULL
description	text	YES		NULL

Keys and Index

SHOW keys FROM Animal;

Table	Non_unique	Key_name	Seq_in_index	Column_name
Animal	0	PRIMARY	1	id
Animal	0	ind_uni_nom_espece_id	1	nom
Animal	0	ind_uni_nom_espece_id	2	espece_id
Animal	1	fk_espece_id	1	espece_id
Animal	1	fk_race_id	1	race_id
Animal	1	fk_mere_id	1	mere_id
Animal	1	fk_pere_id	1	pere_id

SHOW keys FROM Espece;

Table	Non_unique	Key_name	Seq_in_index	Column_name
Espece	0	PRIMARY	1	id
Espece	0	nom_latin	1	nom_latin

SHOW keys FROM Race;

Table	Non_unique	Key_name	Seq_in_index	Column_name
Race	0	PRIMARY	1	id
Race	1	fk_race_espece_id	1	espece_id