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Building Better Software: What About Indexing SQL Server Tables That do Not Have a Primary Key or Cluster Key
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sql server - Is there anything wrong with linking two identical primary keys in two different tables? - Database Administrators Stack Exchange
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Error: "Table 'X' does not have a primary key. You must specify one or more fields." – Support Topics
Can a table in SQL have multiple columns as foreign keys that refer only to one primary key of another table? - Quora
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