Mozilge new toeic part 3&4
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Ngày tải lên: 25/04/2014, 01:12
... relationship R identifying relationship for a weak entity set total participation of entity set in relationship E R E R partial participation of entity set in relationship att primary key COP ... most one value at any particular time instance. A multiple-valued attribute may have several different values at any particular time instance. – For example, consider a particular course at ... a...
Ngày tải lên: 24/12/2013, 12:16