Error updating primary drop
Product Vendor table form a composite primary key constraint for this table.
This makes sure that that every row in the Product Vendor table has a unique combination of Product ID and Vendor ID. A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table.
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For more information, see Delete Primary Keys and Create Primary Keys.
Primary keys and foreign keys are two types of constraints that can be used to enforce data integrity in SQL Server tables. This column, or columns, is called the primary key (PK) of the table and enforces the entity integrity of the table.
These are used to maintain integrity among related data in different tables.
Employees may have only one primary job at one time.
In cases where the Employee's Primary employee record has been terminated, another employee record must be designated as the Primary employee record.
db_drop_primary_key('flagging'); // Change field 'fcid' to 'flagging_id'. ** I cannot believe this has never showed up before, it looks as a problem within the driver itself because it is trying to set a PRIMARY KEY constraint on a NULLABLE COLUMN it has created itself (technical primary key AKA '__pk').
db_change_field('flagging', 'fcid', 'flagging_id', // Spec of the field. This was addressed in the patch from my first post, but that patch does not cope with the problem that some __pk columns have already been created without NOT NULL clausule.