How do you set up a foreign key in SQL Azure?

问题

How do you set up a foreign key in SQL Azure?

I have a database now on the Azure system.

The tables in the database have an intended use such that there is one main, logically centralized table and then there are a number of tables which each describe some column in the main table. For example, if I have an age classification column in the main table, I might have a separate table which lists some categories of the age classification (as a string) and some associated index. Then the index from the age classification table would be used as a reference in the main table.

Is this what a foreign key is? Is there some way in SQL Azure to make the association between these indexes?

回答1:

yep - that's what a foreign key is.

Perhaps the easiest way is using t-sql in a SSMS query window

alter table MyTable
add constraint MyTable_MyColumn_FK FOREIGN KEY ( MyColumn ) REFERENCES MyOtherTable(MyOtherIDColumn)

(from: How do I create a foreign key in SQL Server?)

SQL Azure is different from other SQL Servers in some respects, but not in terms of this simple command.

I found the SQL Azure Migration Wizard invaluable for converting 'normal' sql to Azure SQL.

来源：https://stackoverflow.com/questions/12384966/how-do-you-set-up-a-foreign-key-in-sql-azure