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The document is an Authorized Federal Supply Schedule Price List from the General Services Administration for EGB Systems & Solutions, Inc., detailing their contract for Advertising and Integrated Marketing Solutions. It outlines the services offered under Special Item Numbers (SINs) 541-3 (Web Based Marketing Services) and 541-4F (Commercial Art and Graphic Design), including labor categories, pricing, order terms, and contractor information. The contract period is from September 10, 2009 to September 9, 2014.

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Can a foreign key contain a null value?

A foreign key containing null values cannot match the values of a parent key, since a parent key by definition can have no null values. However, a null foreign key value is always valid, regardless of the value of any of its non-null parts.

Can foreign keys be null and repetitive?

It is possible to have more than one foreign key in a table, and they can accept a null value. Foreign key values do not need to be unique; duplicate values can be stored in foreign key columns. Foreign keys do have to link back to columns with unique values. Those columns are frequently primary keys.

Can primary key be a foreign key?

It is perfectly fine to use a foreign key as the primary key if the table is connected by a one-to-one relationship, not a one-to-many relationship.

Can a foreign key be null value True or false?

A FOREIGN KEY constraint can contain null values; however, if any column of a composite FOREIGN KEY constraint contains null values, verification of all values that make up the FOREIGN KEY constraint is skipped.

Can you make a non primary key a foreign key?

A foreign key can refer to either a unique or a primary key of the parent table. If the foreign key refers to a non-primary unique key, you must specify the column names of the key explicitly.

How do I choose a foreign key?

A foreign key column in a table points to a column with unique values in another table (often the primary key column) to create a way of cross-referencing the two tables. If a column is assigned a foreign key, each row of that column must contain a value that exists in the foreign column it references.

Can a key have a null value?

A primary key is unique and only one contains for a table. There are many unique keys that can contain in a table. In SQL Server, the primary key is not Nullable. But, a unique key may contain only one null value.

Can a foreign key value be null?

A table can have many foreign keys. A foreign key is nullable if any part is nullable. A foreign key value is null if any part is null.

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