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In order to relate any two files, they simply need to have a common field, which makes the model extremely flexible.
Poet Code First Name Surname Age
1 Mongane Afrika 62
2 Stephen Serote 58
3 Tatumkhulu Watson 29
Poem Title Poet
Wakening Night 1
Thrones of Darkness 2
These two tables relate through the code field in the poet table, and the poet field in the poem table. We can see who wrote the poem 'Once' by following the relationship, and see that it was poet 3, or Tatumkhulu Watson.
In 1970, when E.F. Codd developed the model, it was thought to be hopelessly impractical, as the machines of the time could not cope with the overhead necessary to maintain the model...
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