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Adding Contraints to SQL tables

Constraints are important within a database structure as they insure database integrity.

This useful SQL command shows how to add constraints to existing SQL tables.

In this command a constraint between 2 tables (tblCountries and tblCompanies) is being created called FK_tblCompanies_tblCountries.

alter table dbo.tblCompanies add constraint FK_tblCompanies_tblCountries foreign key (ISOCountryCode) references dbo.tblCountries(ISOCountryCode)

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