Question related to unique key
Posted by:
g_p g_p
Date: March 16, 2009 07:43AM
Hello, whenever i'm creating a table i specify which of the fields is the primary key e.g.
create table mouse(ms_id integer,
manufacturer varchar(50),
connection varchar(50),
primary key(ms_id));
What is unique key? is it obligatory to place a unique key and what does this mean?
Thanks,in advance!
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Question related to unique key
March 16, 2009 07:43AM
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