does not have a primary key defined. The identified columns must be defined as NOT NULL. A table can have at most one PRIMARY KEY constraint, but can have multiple UNIQUE constraints. with an enabled foreign key constraint, Derby checks that the row does not violate Error 6002 The table/view AdventureWorks.dbo.BuildVersion does not have a primary key defined. The key has been inferred and the Primary Key does not allow Nulls. Now the two columns already have Primary key NodeID and EnrollmentNo now i want to add another vw JobWBS does not have a primary key defined. The key has been inferred and the definition was created as a read-only table/view. A relational database must always have one and only one primary key. Primary keys typically appear as columns in relational database tables. Entity Framework requires each entity to have a key. with base( name EducationEntities ) which does the same. you change the order of the properties this will not change the primary key i.e still Id will be the primary key. The table/view does not have a primary key defined. Get Database Answers about Mysql, Sqlserver, SQL, Oracle, Sqlite, Postgresql, TSQL, Access, Database How can you know that you are using the correct primary key and that you . While you have defined a Foreign Key relationship that does notÂ