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database design - MySQL is there a point to having a primary key on a lookup table which referrers to a primary key on another table which is indexed? - Stack Overflow
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KB-1413 MySQL Best Practices - Primary Key or unique index on every table - Appian Knowledge Base - Support - Appian Community
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database design - Should lookup tables enumerating strings have an integer primary key? - Software Engineering Stack Exchange
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mysql - Is it required to have primary keys from both tables in lookup table as well? - Stack Overflow
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