Ajude a Asast
Patrocinadores
Últimos assuntos
» Novo site para desportistas / New site for athletes
Composed PRIMARY key EmptyTer Dez 04, 2018 8:19 am por Admin

» Check used port with the command line
Composed PRIMARY key EmptyTer Dez 04, 2018 8:10 am por Admin

» Check the port where mariaDB is running
Composed PRIMARY key EmptySeg Dez 03, 2018 4:59 am por Admin

» Check the linux version
Composed PRIMARY key EmptySeg Dez 03, 2018 3:12 am por Admin

» Granting rights to a database for a user
Composed PRIMARY key EmptyQui Nov 29, 2018 2:04 am por Admin

» Create new user
Composed PRIMARY key EmptyQui Nov 29, 2018 2:01 am por Admin

» Change level of password security level
Composed PRIMARY key EmptyQui Nov 29, 2018 1:59 am por Admin

» reactJS - A JavaScript library for building user interfaces
Composed PRIMARY key EmptyQua Out 24, 2018 3:02 am por Admin

» Count number of lines in all files existing
Composed PRIMARY key EmptyQui Jun 28, 2018 4:53 am por Admin

AdSense
Contributo

Composed PRIMARY key

Ir em baixo

Composed PRIMARY key Empty Composed PRIMARY key

Mensagem  Admin em Qui Maio 26, 2016 5:49 am

Here is how to define a composed primary key in MySQL:

Código:

ALTER TABLE table_name ADD PRIMARY KEY(idcol1, idcol2);

and if the table has already a primary key:

Código:

ALTER TABLE table_name DROP PRIMARY KEY, ADD PRIMARY KEY(idcol1, idcol2);
Admin
Admin
Admin

Mensagens : 607
Data de inscrição : 21/01/2008
Idade : 41

Ver perfil do usuário http://forum-informatico.forumeiros.com

Voltar ao Topo Ir em baixo

Voltar ao Topo


 
Permissão deste fórum:
Você não pode responder aos tópicos neste fórum