This is personal study note
Copyright and original reference:
https://www.youtube.com/watch?v=c7o4ygOnP1M&list=PLuHgQVnccGMDF6rHsY9qMuJMd295Yk4sa
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ER master: ermaster.sourceforge.net
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create 3 tables
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Start to make table detailed from the table which doesn't have FK
physical name: table name in DB
logical name: helper name
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add other column
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author table has been created
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topic and comment tables have been created