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Editorial Team
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Asked: 2026-06-12T17:42:59+00:00

I have table stucture: table { `id` int(11) NOT NULL AUTO_INCREMENT, `content_type`, `protocol`, `content_id`,

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I have table stucture:

table {
`id` int(11) NOT NULL AUTO_INCREMENT,
`content_type`,
`protocol`,
`content_id`,
`hash`
}

I’m adding unique key

alter table delivery add unique (content_type, protocol, content_id, hash);

How can i avoid duplication of keys if run query X-times;

Example:

UNIQUE KEY `content_type_2` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_3` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_4` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_5` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_6` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_7` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_8` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_9` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_10` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_11` (`content_type`,`protocol`,`content_id`,`hash`),
UNIQUE KEY `content_type_12` (`content_type`,`protocol`,`content_id`,`hash`),
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1 Answer

  1. Editorial Team

    Use a named constraint, which should fail if you attempt to create the same constraint twice:

    ALTER TABLE delivery ADD CONSTRAINT my_constraint_name UNIQUE (content_type, protocol, content_id, hash);

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