mysql - DB Design - Contextual constraints -

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i have pair of tables parent-child relationship.

  domain:      id int not null auto_increment primary_key      domain varchar(100) not null    domain_url:      id int not null auto_increment primary key      domain_id int not null      path varchar(512)

here want keep path unique in 1 domain. across domain path can duplicating. best constraint apply on path.

should focus on composite key between domain_id , path. composite key reliable solution?

i think want apply unique constraint in domain_url table on domain_id, path composite key. enforce requirement "to keep path unique in 1 domain"


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