PostgreSQL Unique Constraint - javatpoint
SQL:How to create PRIMARY KEY On Multiple Columns in New Table using Constraint Statement - YouTube
![SQL PRIMARY KEY: Learn with 9 queries [Create, Alter, Drop]](https://www.jquery-az.com/wp-content/uploads/2018/05/43-1-MS-SQL-primary-key.png "SQL PRIMARY KEY: Learn with 9 queries [Create, Alter, Drop]")
SQL PRIMARY KEY: Learn with 9 queries [Create, Alter, Drop]
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Primary key on two columns sql server
Creating composite primary key in SQL Server - Stack Overflow
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SQL PRIMARY KEY: How to Create & Add to Existing Table
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Primary key on two columns sql server
