Can anybody plz tell me how to add a foreign key an existing table using 
SQL Queries?
>> I got the command, nut can't understand 

ALTER TABLE distributors ADD CONSTRAINT distfk FOREIGN KEY (address) REFERENCES 
addresses (address) MATCH FULL;


What's  "distfk" here if it is key name what is (address) ? and what is 
addresses(address)?
And What does mean Match Full


Thanks in advance 
laxglx

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