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It is still a quandary, to me at least, that in the exact same environment (VS2013, EF 6.1.3, SQLServer2012) adding data model from one database provides the association automatically but not for another.
Column constraints and table constraints have the same function; the difference is in where you specify them.
Entity Framework uses this conceptual model while querying from the database, creating objects from that data and then persisting changes back to the database.
The first iteration of Entity Framework, which came as part of .
Fluency with SQL is necessary for effective communication with the My SQL server, because that is the language that it understands.A UNIQUE constraint defines a set of columns that uniquely identify rows in a table only if all the key values are not NULL.If one or more key parts are NULL, duplicate keys are allowed.For example, when you use a program such as the mysql client, it functions primarily as a means for you to send SQL statements to the server to be executed.You must also know SQL if you write programs that use the My SQL interface provided by your programming language because the interface functions as the means that allows you to communicate with the server by sending SQL statements to it.