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Add primary keys to multiple tables
I missed these keys when creating the initial schema, and it's a useful practice.
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CREATE TABLE `Collections` (
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`CollectionId` int(10) unsigned NOT NULL AUTO_INCREMENT,
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`EbookId` int(10) unsigned NOT NULL,
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`Name` varchar(255) NOT NULL,
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`UrlName` varchar(255) NOT NULL,
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`SequenceNumber` int(10) unsigned NULL,
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`Type` varchar(255) NULL,
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PRIMARY KEY (`CollectionId`),
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KEY `index1` (`EbookId`),
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KEY `index2` (`UrlName`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
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