Concurrency Check used to handle conflicts that result when multiple users are updating (or deleting) the table at the same time. You can add the ConcurrencyCheck attribute on any property, which you want to participate in the Concurrency Check. This attribute works the same way in both EF 6 & EF Core.
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The complex type attribute denotes the class as a complex type. The complex type is a class, which is similar to an entity, but with few differences. The Complex Types are not available in EF Core.
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Table attribute overrides the code first convention, which creates the table with the name same as the class Name. This attribute is applied to the class
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Entity framework uses Code first conventions to name columns after the property names. You can override this behavior using the Column Attribute
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The Key Attribute or Primary key attribute maps the property as the primary key column in the database. This attribute is applicable to both Entity Framework & Entity Framework Core. In Entity Framework, we can use it to create Composite Primary key, while in EF Core it is not supported.
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