foreign key type uniqu mysql

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Soan
06 Jan 2018
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5     CREATE TABLE products(
6    productId INT AUTO_INCREMENT PRIMARY KEY,
7    productName varchar(100) not null,
8    categoryId INT NOT NULL,
9    CONSTRAINT fk_category
10    FOREIGN KEY (categoryId) 
11    REFERENCES categories(categoryId)
12        ON UPDATE CASCADE
13        ON DELETE CASCADE
14) ENGINE=INNODB;
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Ilias
06 Jan 2018
1mysql > create unique index index_bar_id on foos(bar_id);
2mysql > alter table foos add constraint index_bar_id foreign key (bar_id) references bars (id);
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